What could happen? Over-stimulation of the brain in unusual patterns is usually known to result in seizure not fainting. But people can actually faint from fear or the feeling of horror, this is known as
vagal nerve fainting.
Do you really want to find out?
Worst case scenario you could have an underlying mental disorder and yet you don't know it and then you wind up spending the rest of your life in a mental institution because you can no longer see reality the way you did and can no longer respond to it in the way you did.
Best case scenario, well... just read Global's post again
Quote: I've had experiences that have involved such high levels of bliss, that I wouldn't even consider fathomable
I guess it might depend on a few things:
the state if your brain health
what the cause of your fear is
the nature of the stimulus causing you to freak out (if it was bizarre, insane, complex & psychedelic information then to me it would seem more likely to result in a seizure ((did you know de ja vu is like a mini-seizure in the temporal lobes?)) but if it was just say purely based on fear or shock then it may be more likely to a vagal nerve faint)
However that is just speculation! What it really is could be many different things or a combination of those things. However what you describe has been known to be shared with psychedelic users before, especially ones that aren't used to it or haven't learned how to deal with it or are just plain not able to handle it ever. I have heard others say on here that some people just should never take psychedelics. I am not sure whether that is the case with you but it may be otherwise. At the end of the day, it will be your choice whether or not you go through with it.
If you do decide to continue then I suggest just taking some very minute doses at first 1-5mg and see if anything weird starts to happen once you are sober again. If it is fine then go 5-10mg etc. Goodluck