I had a similar situation happen to me a few years back, in 2005.
I went to a house party at a friend of mine's house. My brother and cousin were also at the party, so I wasn't worried about my safety. I also knew this person for a number of years, and had been drinking with this person on many occasions with no problems.
This night, I had way too much to drink. Against my better judgment, I went to this person's bedroom alone. I passed out flat drunk within minutes. I woke up the next morning and was in a lot of pain. My bra had been cut off with a knife that was laying on the floor next to me, along with a used condom. I immediately left. I reported him that afternoon. The next day, the police came to take pictures of all of the bruises that were on me. I had perfect handprints on my inner thighs where he had to hold my legs open.
He was taken to jail, but was bonded out a few days later. $50,000.
The investigation went on for almost a year. I was in close contact with the solicitor and let me tell you, it gets brutal.
She couldn't guarantee me a conviction because he and his lawyer maintained that it was consensual. After a year, I finally dropped the charges because I refused to get on a stand and be made out to be a who** (that's what a defense lawyer would do).
I wish you better luck than I had with this situation.
EVEN if you are unconscious, rape is rape. You can't give consent if you are not awake.