Welcome, read the stickies at the top of this and the Family & Friends of Substance Forum, lots of information about addiction. Also, I agree with Suki, meetings will help.
It is not healthy for your child to be exposed to a toxic alcoholic, she should be your first
priorty.
This is a progressive disease that has no cure and now he is using drugs, the combination will continue to get worse, and, there is nothing you can do. He is an
adult and this is his problem, not yours.
Let him go, move forward with your life, nothing good will come out of this relationship, it is a dead end.
Keep posting, it will help.