Wow, I really dont know what to say. I dont think I would be able to trust anyone who raped me. Its almost worse because he knows your history and still decided to do it, even after you told him to stop the first time. It doesnt sound like he is respecting your boundaries. I am married and would have a very big problem waking up to my husband having sex with me. Then again, I dont sleep that deeply and would likely wake up before it got too far... are you a deep sleeper?
Are you considering getting off the pills and trying the sober route? Does your Fiance take drugs or alcohol?
It sounds like you are in therapy, what does your therapist say about all if this?