Is it normal that i enjoy being angry?

OK, well..obviously, I know I am not normal, but I would like to get input from you. Lately, I have been so angry! Even someone looking at me the "wrong" way could trigger something inside me that would make even Satan cower in fear. It's getting to be a constant emotion for me, and it's physically draining. It's impossible to take a nice drive anymore (which I used to LOVE doing since I would just put on some music, drive down the highway and put my troubles aside for a little bit) without getting enraged at someone going slowly in the left lane and not letting me pass. Every single person pisses me off to a point where I can't focus on anything positive. I've always been an angry person, stemming from having major bipolar. But my anger has never been this...constant. And the thing is, part of me, in a sick, sick way...enjoys being angry. Like, yelling at someone or speeding past somebody and cutting them off in the road, whilst flashing them the finger as I speed off, it makes me feel a sense of power. But then..I've always been the kind of person who has hated to upset people. When I'm in the moment, I feel so good about myself. But after the fact, I'm just thinking "What the hell was I thinking?" and I immediately regret yelling or getting so enraged. And, again..it's physically taxing. I get constant migraines and sore muscles, and I'm just so tired all the time...
Does anyone else have this sort of issue? What do you do to combat anger? How do you express your anger without going over the top, but still feel better after releasing your frustrations? I must make a note though, that I'm not the kind of person who can meditate...I've tried it, and the silence just makes me focus even more on my anger and the things that make me so mad. I've not gotten to the point where I yell at my girlfriend yet, but I do NOT want to get there, as I love her so much and never EVER want to hurt her in any way, so any help would be greatly appreciated!