I get really angry too. And I'm bitter I'm told. If you'd been through what I've been through you'd be bitter too. have you tried cognitive or ACT therapy with your t? There are a lot of books out there about those types of therapy that may be helpful.
I was fine until last year 2008. I changed my meds&discovered just how badly I had&was being treated. Everyone liked meek little mousy me&couldn't handle angry raging me. It's slowly getting better with my t's help&meds. Don't give up hope&please don't actually physically hurt yourself. We all beat up ourselves the most. Have you ever discussed the possibility of PTSD with your t? That's where my rage has come from-I've remembered a lot of bad crap from the past&it's really made me mad. Don't let anyone tell you you have no right to feel angry-it's how you feel&too bad if someone else doesn't like it. It hurts!
The therapy advice of saying STOP! to yourself really does work. If I catch myself being a butthead, I say STOP! to myself&apologize to anyone who may have been in my path. Then I try to figure out what made me so mad. With PTSD you have "triggers", things that remind you of the original trauma&you tend to lash out when you get "triggered". Ask your t about PTSD& borderline personality disorder-they both manifest a lot of anger. Hope you can get some help-