Struggling with Anger: Need Help!

I've been struggling with anger a lot lately, and I'm going to bring it up to my therapist at my appointment in the morning, but last time I brought it up was like 6 months ago and he said that it seemed like I was just really stressed. Since then, it feels like it's gotten worse in some ways and better than others. I know it's worse when I drink so I try not to do that or limit myself when I do, and until a point I'm able to calm myself down. But when it gets bad, like it had when I first brought it up to him, I get violent. I broke a lot of things, I destroyed every painting I'd made, every drawing I could access, even a whiteboard. It never got that bad again until this past Sunday. I punched a hole in a wall, my hand got really scratched up and luckily that pulled me out of it before I was able to do much else. I put a poster over the hole but I let my roommate know it happened and plan on fixing it soon. I am ashamed of these instances, and the not-as-bad events between them, but if I can't cool down before I get to a certain level I don't know how to stop. It's like there's fire in my veins and I need to get it out but in the moment I can't even begin to think of regulating myself. I'm hoping my therapist helps, I hope I can explain myself well enough for it to not be dismissed as stress, and I hope I can figure out how to patch drywall