I know I'm a bit of a notorious dosedemon on this forum, but I experienced one of the most traumatic concussions of my life denting the bridge of my nose into with a cofee table, tripping over the carpet one night walking out of the bathroom stone cold sober. For about four months I could not read or write meaningfully, could not walk in a straight line, was virtually never not in a state of meaningful delirium. Throughout this period I did a lot of insane and reckless shit with drugs. One of them was insufflating 25mg of DOM, 25mg of 2C-B, 40ish milligrams of 4-HO-MiPT (miprocin) and then 16 hours later in an attempt to "chill out" I smoked 125mg of 3-MeO-PCP I'd cured into a fist full of joints. One after the other, smoked em down until my reality was overcome with a gorescape of the hallucinations that had haunted me since meropenem induced brain damage at the age of 13, they all reformed infinitely until reaching the shape of a woman who was some sort of "santa muerta" figure, an embodiment of death. She explained that I'd come far too close to death far too often for it to ever lose its taste for me now. The more I focused, the more I realized that the woman I was looking at was myself, it was quite a fascinating experience. Since then even the worst of psychotic effects I can experience while fully unmedicated are fucking child's play compared to before that experience, but this was also within a couple months of a 37.5 milligram LSD experience and a few other real impactful ones, so that entire period of my life had a lot going on.
Edit: I'm writing like I'm concussed again (haha) but it's just the 2C-B I'm on, sorry about that.