I've found the best way to deal with anger is to put it in the box. When something or someone even a random thought pisses you off, don't think about it. Don't forget it, just put that bit of anger into a box. I know it sounds spazzy, but you will soon start to enjoy saving those bits of annoyance. The more you save- the more laid back you will be. Then one day, and that day will surely come, when you need it, you will have a big fuck off box full of festering rage, anger and hatred to unleash on the fuckers entirely for your own self defence.
Derek Bird told me that. Works with voices too.