Funnily enough I was in the hospital last weekend completely out of my tree and tripping so hard I could not see. I had taken a very high dose of 2-CI (by mistake - long story) and I was absolutely sure I was going to die. The doctors would not give me anything to calm me or sedate me they put me in a cubicle and left me alone for as long as it took to ride it out and come down (I was convinced I would never come down). When I arrived there they did regular checks on vital organs and when these proved OK they left me to ride the high tide.
I swear to god I thought I was dying, I felt completely toxic and that there was no way I would be returning to 'normal' EVER.
I started to return about three hours later (quite swiftly) and an hour after that I was ready to go home.
No amount of begging would persuade those doctors to give me anything to help me through it.