I also have some personal experience with psychosis, although I don't want to disclose it on HN. How do you personally know when you're done experiencing it and have "returned to normal"?
It depends on how deep it is. At a certain depth the only thing that can alert you (if you have it as a tenancy like I do) is the reactions of other people. THC can amplify the effect but CBD can dampen it. I don't know why I use either. I'm just imperfect that way. I'm bad to the bone.