If you need to apologize, that can wait. First things first. You need to protect yourself--from both of them, at the moment, it seems.
If I were you, I'd consider getting a restraining order against him (not letting you leave the room is considered domestic violence), and avoiding contact with her for the time being. Let things settle down before you talk to her again. Parents are in a tough spot with alcoholic children--not that that is an excuse, but she is suffering in her own way, too.
Hugs,