Without having ever been the victim of sexual violence, I can only do my best to offer empathy and support.

First off, please don't allow yourself to fall into the trap of self-blame. He clearly drugged you and took advantage of your impairment; this is unambiguously his fault. He's an asshole and you just got unlucky enough to be taken in by his deceptions. You're probably not the first and won't be the last.

Second, I definitely think it would be a good idea to contact RAINN or a local rape crisis center as suggested by others here, as they will be far more equipped to help you process this than any of us on this forum. I think they will also respect your anonymity if requested. I would love to be able to offer you effective advice or support, but I truly believe they will do a better job than I ever could.

Finally, I just want to say I'm sorry this happened to you. This loser is not a real man; he belongs in prison getting his own back door violated. Hopefully some day he will try this in a way that he gets caught and prosecuted to the fullest extent of the law. No one should be treated this way.

Keep your chin up. You sound like a very strong person and I have no doubt you will make it through this. Don't let the bastards grind you down.