Sorry. It's hard to know how to deal with things. I know from experience, once you move the line of acceptance (it's "ok" if you only drink on the weekends) you don't exactly get what you bargained for. I would be willing to bet, also from experience, that he is drinking during the week and hiding it.
Please don't take this the wrong way, because I really do feel for you and your situation. I'm glad you are not married and don't have kids. Stick around here, take care of yourself, and at least for now take yourself out when he is drinking.
7-8 bottles of what?