To answer to meditative states: normality vs illness of mind, I would answer with my small essay which follows.
"How spirituality do change the human mind"
Sources for this answer:
Bhagavad Geeta [Here taken as Inspirational Source and Comparison for Discussion of this Answer].
References not cited but integrants of the basics of my answer:
Sri Swami Sivananda Yog books
Sri Swami Vivekananda Yog books and books about his relation with God
Stephen Hawkings books about Cosmo
The Schröedinger Experiment of Copenhagen [particle waves], here not cited
Einstein and Enrico Fermi works over the Atom, here not cited,
Books about Neurology [how EEG works and what are the Neurons and how they works]
Articles of Yog and Neurology [how Pranayama do change the brain waves].
This Bibliography is to justify the experience on books that I have, other than the personal one.
Deluded the human mind constantly is, whenever they realize this or not.
The same Dharma Shastras and Bhagavad Geeta especially, do point out the realization of meditative states through the connection with God.
In BG it is the following of Krishna aavatar of Vishnu, to help Arjuna to overcome and win two types of battles.
The outer battle is only a metaphoric into material actions, set of happenings, which reflects the aatma condition of all the human beings.
If we take the entire book of Bhagavad Geeta, we encounter numerous examples of how Arjuna is transforning himself, through his various questions to Krishna.
In the process of his Spiritual Advancement and Progresses, also Arjuna meet Krishna.
Not only he can hear His voice, he can see Him and His Transfigurations.
It means that Arjuna not only is able to see Krishna inside everything [see Shaiva Siddhanta and Kashmirian Shaivism in order to have a crossed linked referencial comparison to what it is to see God] because Shaivism teaches that Shiva is in everything and everyone.
Also SpandaKarikas, the "vibrations" of Shiva and other books like that, do explain how some people "feel" almost physically or mentally or by aatma sensations, the manifestation of Shiva ParamIshwara.
Arjuna see the very Tattvas of Krishna. He can see Him embodied several kinds of bodies.
The way in which God do manifests for Arjuna is so surprisingly for him that he feels any feelings, initially.
The same Krishna states that few human beings can bear all the emotional pattern and impacts, in order to really see God as a Entity Manifested [Sukshma Swaroopa].
So the seeing God do requires at least that social conventions accorded to the living era are overcome.
Seeing a God or the God it means first of all accepting the existence of the supernatural that is nothing but the Not Visible to become for us visible, making our mind ready to accept it.
There are many invisible things around us such as atoms or particles. Normally are waves but we see them as particles.
Many invisible things are simply the Cosmologic substance, so also taken as existing by Science of the East and the West.
Until here we can peacefully agree.
So that see God may signify see the Sattva Guna predominance that is dear to a state of bliss, like when the Kundalini is going on over the body, overcoming in the streaming all the Nadis blockages and purifying those by they being closed.
So Pineal Gland is constantly reopened.
All of this seem a normal process if described like that but the physical body obviously do receive impacts, if it was used to live alone in a dull dumb environment of a modern era society like ours of nowadays.
It is not mentioned in Mahabharata chapters, Bhagavad Geeta included, how Arjuna feels, given that he is not a yogini and this is not the typical dialogue of a sage or a Rishi in the regards of the Gods.
The Yuga of Ramayana and later on Mahabharata was still a time in which communicate with the Gods was considered normal.
Not only that, but also meeting with other celestial bodies was very much considered as normal.
Time after time the humans came to Devolve, to Downgrade, hence nowadays they are only able to consider themselves brilliants and intelligents because they can manipulate an illusory part of the prakrti and in a very delusional and ephimeral way.
Coming back to who Arjuna is:
It is evidence that the path of Arjuna make him starts as a with moral individual [this pre-requisite is very much necessary in order to approach to Yog disciplines as like to Sanatan Dharma.
Whenever an individual present too much skepticism towards the immaterial, uncountable world, whenever individuals are attached strongly to: money, career, commodities, luxuries, sexual life, eating like a King, drug addiction with heavy substances, alchool in large amount and so on and so forth, the humans in these conditions, actually are the "deviated" ones].
Arjuna coming from the simplicity of being a Warrior, should theoretically only care about: technical strategy, military organization or order to follows or to impart, success or failure on the basis of how many humans he will kill or not, etc.
Why he is struggling inside so much then as to start to speak with Krishna Ishwara?
Because he is a ethic and moral man.
Why this happens to him?
The need of a human can never be only material as per the jivaatma constitution of him.
Arjuna felt this urgent need, because his jiva was very much mature to go to the path of Renunciation.
Bhagavad Geeta is very clear about Performing Actions with Detachement. It means to focus on Morality and Ethics for the Urgent Duties but not to indulge in a life-style made of materialism.
There must be a Balance into that.
Austerities of the most strict Yogini are performed because They lost completely the interest for Maya.
Yet Krishna does not say that one must go into that states and forget the life around them.
But surely the life-style will change.
Not because a GuRu tells so, but because the sensitivity of the Consciousness will be triggered.
And so the Second Body will need to be Feeded.
And Meditation and Moral and Ethic ways will become the new Feedings.
The bodies are 3, according to the eldest Science of Sanatana Dharma.
Well, once you give food, pleasure and commodity to the phisycal body, only the most dumb dull type of person can really think "oh now I am cool with that".
Certainly and very honestly, in the depth of the human mind ideas and thoughts, there is that moment of " emptyness".
Several people in the West also are considered "Depressed" psychologically by the science men of the West, because they open their heart and consider themselves "down, sad or empty".
The science of the West give them fantastic speeches about the Non-Sense and the Psychologists must take care themselves never to mention the spirituality, else they will be taken as crazy.
The Modern society goes against the Spirituality.
Such is the reality of last 2.000 years going progressively into the negation of the causal body and the astral body.
Thanks to this tragic process, promoted by Kali Yuga, the beings now are literally using one really thin portion of their own brain.
Could the humans all go into Vayu Siddhi and win the gravity before?
There was a time, before, lost in the Rig Vedas and oral teachings memories, in which: yes, mostly humans were capable of that.
Unlocking that potential now, do requires more effort because it is too much strong the Devolution and Deterioration process of the jivas throughout Centuries of Wars, in which the maximum teachings received are to take " control" the subjective matter around us.
What a delusional idea.
Instead of taking back the process of Liberation, the humans became selfishly lazy fragile and dependent to objects.
In such a world, visions derived from Tapas, as like, and why not, encounter and meeting, not just with imaginary or manifested forms of Gods but also flesh and bones particular gifted humans, aliens or other creatures, it is considered unacceptable by the Science of The Ignorance.
The same 3 dimensional Scientists of the Delusional Plan of Existence [the Maya] are amazed and puzzled by their incapacity to analyze certain phenomena.
Do you remember that Stephen Hawkings many years ago before he died, discovered "unconventional" "behaviours" of the photons related to the black holes so called discovered into Universe this one?
It is incredible only when we think that someone, dued his or her power [institutions, govs and so on] decides that they can define the Cosmo, decide how particles should move, expecting bosons and photons to "obey" to them....
Yet, this is the world in which we are living: a world in which all the people who have more developed jivas are suffering, either inner side or for other causes, because The Others = The "Normal" Ones, that is: The Doctor, The Engineer, The Scientist, etc are Deciding that Nature and Cosmo [and so humans, plants, animals, rocks] must obey to them.
And when they fail by doing this, they kill, they menace, they make people to their "care" places, in order to de-powerize the jiva of people.
Because the dullest and the dumbest you are, the happier these manipulators are.
Sad truths, considerations coming by experience, Bhagavad Geeta reading and analysis, Sri Swami Sivananda and Vivekananda readings and also SadhGuRu ones.
Last conclusive lines.
"And they can master the scriptures even if they never have read them before. Such way these blissful states of samadhi gives to the practicioner a kind of gift for everything spiritual. Only when distracted if the mind is not steady, it will clash again against the Maya miserable condition of the other non-involved into sadhana, humans. If the practicioner is not able to keep his dharana, also in vipassana ways, then they will be considered "crazy" by the non involved into sadhana people and folks".
Conclusion like summary:
Wether that "vision" was imaginary or real, define reality at first.
If this does not make you feel bad, then keep it to yourself, do share only with few, because too many are envious, others are dull dumb but easy to be scared.
Their scares are Neuronal Waves substances.
Every emotion produces this.
There is EEG to prove the same that Yogini already do knew millenniums of years ago.
That emotions play a role into neurological response. That is normal for everybody of us.
Direct Answer to the Question:
Seeing God in Everything is not bad, unless is not a evil god.
Of course if your friend was happy to see God everywhere. Maybe he forgot to do his homeworks.
Is this enough a reason to ruin his brain with an electro-schock?
If he tried to murder or harm someone, then he did not see any God but he was becoming crazy like Constantine the Emperor maybe.
Jokingly a part, meditative states are to be conduced in the practices, compatibly with a big choice to operate: being less and less involved with daily life duties.
It is obvious the reason why. I explained before on the above that the majority of the daily life people are living into Delusion of Maya.
So for them material things are too much importants to accept to Renounce to these.
The Fear of other is what makes you cultivate Fear and change abruptly....
The realized Jivas bear the big Responsibility to handle with care the "about to waking up" people.
They must definitely avoid to talk their inner or outer experiences with the Dull Dumb ones mentioned above.
Your experience will scare the dumb dull ones and they will see only a thiny reflection of a subconcious stream of that ancenstral and very remote "I know that this is possible".
But in the name of Habits, Fame, Money, Normality which is the cover to their Fears. Because they are Afraid. They will over react on you.
If the Yog practicioner has a relaxed, distended and harmonious mind, and if he sees gods, demons, angels, aliens, if he exits out from the body, fly or jump like a frog, these are Siddhis.
Western Science can Not explain Siddhis and more than that, it can never accept those.
Western Science Loves Gravity.
Nobody really accepts that Micro and Macro Cosmos can not completely be measured.
The tendency is to dominate and be tyrants of these both.
Who is normal now then: the dumb dull who easily kill and over react by hurting others, kill or make more pollution and harm by " experimenting" their "cares", or a yogini who simply had spiritual meetings?
Of course the idea of seeing God was normal in Rig Vedic times, not in the times in which the Bank is the God....
So that if Reality is a big Dream, those dreams inside Reality, maybe, are connections to other Worlds.