Low Sex Drive :( Please Help

I can't figure out what's wrong with me. I have a wonderful boyfriend that I love more than anything, but I have zero sex drive. It's gotten so bad that he thinks I'm not attracted to him anymore. We even had a huge fight over it last night and he actually got drunk. And he refuses to drink around me (I can't drink for medical reasons) for the most part. Until last night I'd never seen him have more than two sips of something alcoholic. I just don't understand what's wrong with me or even how to fix it. Any advice or thoughts would be greatly appreciated