I am sorry you are having problems and I have been wondering how you were and how you ended up handling the drinking issues ?
I don't usually state something so strongly but over the years I have learned to keep my personal friendships separate from the place where I work............that being said after 43 years of marriage now, it is not a big problem for me.
I have seen this very issue destroy marriages, lives and bankrupt people. I am not saying you should quit and run however with all you have going on starting a serious romance right now may not be a healthy decision for you.
Having managed people for all of my career I had to deal with some pretty dicey situations when people began dating their co-workers. Step lightly my friend.