Well yeah. We can only go off of what one person said. It's a forum, and thus limited to what the person said. But if what OP says is true, it was certainly rape. Unfortunately, none of us can actually say for sure, except OP (but he wanted advice from people). So people gave it.
If the situation he says happened, it was rape.
OP says he said no, she said it's okay and continued regardless. He then can't remember anything else because he was too blacked out. If he's too blacked out to consent, then he can't consent. Further, she apologized to him the next day (implying she was sorry for something). I mean, I don't know what else to say. If someone is too blacked out to consent, and someone has sex anyways, I don't know what else you would call that BUT rape....