I'm not trying to label what happened, but in many states (as far as I know--someone can correct me if I'm wrong) consent can not legally be given if one is under the influence of drugs or alcohol. And it sounds like you were way past the point were "under the influence" would be called into question. I'm not sure where you live, but it might be worth looking into if you decide to report it.

As everyone else has said, this is not your fault in anyway. He took complete advantage of you, and I'm really sorry for that :( I hope that you can find someone to talk to--anyone that you can trust--because you shouldn't be beating yourself up about this at all. *hug*