Mine dissapeared by time. I had in last 5 years who knows how many (even I lost the count) LSD trips and 3 DMT trips and so many times used weed, ketamine and mushrooms, MDMA's and khat, tried 2C-something and I was fine all the time. I guess it's individual. But that was happening to me before I took any drug. When I first tried psychedelics it was "aha I've seen this before". I can't say is it spiritual experience or not. Just what prismatism wrote reminded me so much of it. I'm just curious now did your friend reacted like that on his first trip or after some time?
You need to seek medical attention, I know it sounds like the cool spiritual thing to think god is talking to you or you are experience some sort of spirit accension, but you could also have a serious condition such as a brain tumor or blood clot. I have a degree in psychology and have worked with a lot of schizophrenics, and you would be more delusional and not realize it as an illness but as reality. It doesn't sound like mental illness as much as some sort of physical pathology. Seek medical attention, hopefully it's just epilepsy, not that epilepsy isn't serious as well, but make sure you don't have a tumor or something.