I have never been on an antipsychotic, but I have anecdotal evidence of them being kept on hand during psychedelic trips. The idea is that if the trip is too intense, they can essentially shut it off with the antipsyche.
You story mirrors this idea, but would seem to indicate that the mental imagery you experienced before antipsyche is activated by the same mechanism that activates psychedelic hallucinations. I have always felt that they might be related/the same, but I think there is research showing they are different mechanisms.
Then again, maybe your pre med mind was utilizing the hallucination mechanism and that is what the antipsyche shut down. I do not know how all the chemicals work obviously, but I enjoy trying to figure this all out.
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