Edit: actual lsd, not an analogue. I have also had brutal nightmares, but that's not even remotely close to the same scale. A nightmare is nothing by comparison.
Almost never post, handful of times in the many years of this account. But it's story time, for anybody wondering how bad a trip can get. IMPORTANT NOTE: this happened on a sheet of acid. Don't eat a sheet of acid unless you are willing to consume ridiculous doses and ride the results good or bad.
Skip ahead a bit, and past my life choices; I was comfortably high, about 40 minutes in. Very much intense, but not more so than some of the mushroom trips I've had prior at this point. It is becoming insanely difficult to move, I keep trying to accomplish something and forgetting. It's very frustrating so I decide to lay down and put on a movie to try and refocus myself for a while (starship troopers if it matters). Within the next ~30 minutes (time was stretching minutes into hours, so loose estimate) I started physically falling down through my body. I could see through the environment, and was just watching myself watch the movie as I descended. I had very little in the way of real thought, but I remember being peaceable enough, I found the experience vaguely hilarious even. Fast forward what was probably only another minute or so and my descent is finished, I end up in the black. I can't hear, feel, or see anything. Almost completely dead senses, except a very painful burning sensation. I started trying to get up or away but I couldn't, I was bound in place by some vaguely defined 'chains'. Upon noticing this, everything else becomes a very much vague repressed blur of horror. I spent absolute eternities in this location, at first bound for what seemed like thousands of years just being burned from below. Eventually I became numb, and creatures came to torment me. This was hell to me, I am not a christian nor did it look like what you'd think of when commonly considering such. But it was hell, I knew. This was the tortures of a demon. Even being shredded apart, disemboweled, and murdered time and time again got 'easy' enough to deal with. After that, they started letting me try to escape, or fight back. The sheer hope of freedom from that bring crushed endlessly.
I don't know how bad this sounds to you, but even trying to recall the details now has me in cold sweats with a dread directly to the core of my being. In all my trips combined with all my life, I spent more time in that pit by far than all the rest combined. There is no fear greater than strong psychadelics and your own mind conspiring against you.
