So sorry for you and your family
Try a good psychologist who also can also do therapy for him. You should be at the 1st appt so you know he is being honest.
If he is self medicating the depression he needs to treat that 1st, otherwise he will become a "dry alcoholic"
We have learned that alcoholism is a symptom of an underlying issue
Btw, I could have written your post a year ago, it's very scary when you have kids involved but it can get better with lots of patience
We use Neil Williams in DC
Good luck!