Anyway, my question is do you know a good centerting excericise or something that calms you down when you're super pissed off?
You're ahead of the game already, because you know that, when you're angry, you need to find a constructive way of dealing with that anger.
I think the best thing you can do is to find a consistently functional strategy. I know a lot of people focus their anger into exercise, and that can work. But, if you're dealing with issues of sudden, blistering anger (i.e. rage), you need to be able to self-monitor -- to know it's coming -- and then do whatever it takes to back yourself down. That can be as simple as "counting backward from ten," or reminding yourself to take deep breaths, or removing yourself from the negative stimulus. If it's more complex, or if it's a spiral you know you often can't control, you need to seek someone who can help you find productive ways of dealing with that anger (which you've done here, but a professional who's in your real life will likely provide better support). There's no shame in knowing yourself better, or in trying to figure out why everything swirls inside you when
you think it should be settling.
I guess that might seem general, or like a summary, or even naive. Fact is, though, dealing with anger can be an immensely personal exercise. Unless you can embrace your anger (in that it's personal to you and who you are -- that it's not posturing, but genuine you), there's not going to be an easy way to work beyond it.
