I don't have a drinking problem, but I eat compulsively. I finally quit smoking and replaced it with eating. I wonder if it'll ever be filled. Please remember that you cannot help your father other than to pray for him. You did not cause his addiction and you cannot stop it.
Anger is so normal but try to avoid feeling guilty.
Pray for release, both for him and for you. Try to forgive him. God can help with that one. I was with my father almost every day for the 4 weeks he was in the hospital before he died, although he never regained consciousness. In some ways, his unconsciousness enabled the best conversations we'd ever had.