You are in a relationship falling asleep next to a guy you probably fuck every night drunk or sober and one night you are more drunk than normal and you fuck him and want to call it rape?
I don't see it that way and I doubt it would get prosecuted because reasonable doubt seems pretty easy to establish.
That being said....
Nausea and the memory loss doesn't seem to be a regular part of your getting drunk....
You state that he brought the liquor.... Did he drink the same liquor you did or something else? It could be that you were drugged in some fashion or the alcohol content of what you were drinking was greatly increased in some manner. That changes the way it would be looked at greatly. Are any of those bottles still around? You might check them for residue if so.....