i had a rough lsd trip a while ago and at a certain point i was aware of my awareness feeding into itself as it intensified, which made me feel like i could be losing my mind. never felt anything like it before, it was tolerable but very uncomfortable. there was nowhere for my mind to run, it was forced to watch itself run in circles and feeding itself which all culminated in a split second where something popped in my brain.
who knows what died up there