Wow. An appropriate hell indeed. I like this. I pretty much became the character as I read this, and after finishing, I still have the chills. It may sound cheesy, but the room literally got brighter after the story ended. I felt like I was in the dark cave running from this scary stuff. And now I'm cold and hungry.
I would hate to be that guy. I wonder how many times he's looped on that nightmare. I bet he doesn't remember any of it each time. I think that final paragraph is my favorite part of the whole piece. It's just... creepy. To think that he might have been suffering the same nightmare for ages. And will be forever.
One minor complaint, "but that did not tell him very much useful either"... Is there a missing word somewhere, or did you add too many words? It seems to me like you had two ways of wanting to state your sentence, and decided on one way, but forgot to leave out the other. Was it more along the lines of "but that did not tell him very much either"? Or perhaps "but that did not give him very useful information either"? You get the idea.
One more question - I know this was for your writing class, but what inspired you to write this? Was there a given theme or prompt, or did something else help you to decide to write this on your own? I'm curious. ^_^