Welcome, So Tired, glad you're here!
I have not lived with that, but did have a friend who did what your husband is doing; unfortunately he died about 2 years ago. He was well aware he was doing it and threatened to cut off anyone who tried to stop him. I do not know what was driving him, but I have learned by attending Al-Anon and open AA meetings that the disease is cunning, powerful and baffling and I accept that.
I think in your situation I would make some calls to attorneys - most will consult for the first 1/2 to 1 hour for free and see what your options are. I would find it very difficult to watch someone slowly kill themselves in our home.
Please keep posting - it helps to know there are others "out there" who have lived it and care very much.
((()))