Can I just ask if you are sure it’s just alcohol he is using. It’s just the paranoia sounds so similar to incidents I had with my son who was on cocaine.
We would jump from one crisis to the next it was never ending and it would normally happen at a time I was planning to go away or do something nice for me. I can’t offer useful advice because as I’m sure you know until they want things different it won’t happen. May not help if he’s living right near a dealer though and is it possible he owed money and that’s why he was beaten up
It’s an awful situation no parents should have to bear. Thinking of you