We all sometimes have this bad moments. The way you should feel about this ? There is no good or bad way to feel about it. If it was consensual tne you should look at it as a one night stand, maybe he was drunk too, maybe it was just two drunk people hooking up, it happens.
You should do some blood tests honey. You need to see if you are clean for STD’s, and pregnancy test (unless you have the memory of using a condom). This is mainly as a precaution, I don’t want to scare you , it’s just the normal routine in this kind of situation.
Unless this memories haunt you , or they reveal something traumatic and/or ilegal ,then I wouldn’t worry too much about it. We all have our drunk moments sweetie, and they don’t change you as a person , and they do not define you . You live and learn