I've read this story some years ago. I think it was on Fanfiction.net but i could be wrong. Here's what i remember:

- set in season 7 when sam was in the mental hospital;

- in one scene he is given a cup of water(?) but because of his hallucinations he sees it as blood and throws the cup across the room;

- in one chapter he hallucinates that Lucifer is choking him until he loses consciousness, but in reality he chokes himself. He's then found by the staff who wonder if he maybe tried to commit suicide or if he hallucinated and his body turned on itself in confusion.

I know it is not much but that's all i can remember.