I'm sorry your going though this. But you do seem like a very strong together person.
There is something I'd like to say, and I'm saying it only because you're asked for our opinions.
So here is mine: I don't think there is a way, any way at all, that after so much drinking he can just stop without experiencing some major withdrowal symtoms. You said he was drinking vodka every day starting since 9 am. And if this has been happening for years , as you said, he'd have to have strong physical dependancy. I am pretty confident about this, but I stand to be corrected.
So unless he has been detoxing, I wouldn't trust his sobriety. JMHO.
Hope you don't mind me saying this.