I still have sudden, inexplicable flashes of anger. Meds have helped me a lot, so while I no longer experience a drawn-out stream of rage where I break things, I still reach breaking point without realizing that I'm about to.

What helps is to remove myself from the situation where I'm angry, go somewhere quiet, and do some breathing exercises until I've calmed down and can have a rational conversation. I have a pact with my friends and family that if I get upset/angry, we will pause the conversation. I will be encouraged to go to a quiet spot (if I don't do this out of my own volition) to calm down.

Sometimes I dump my angst and anger regarding a particular situation on someone who had no role in it. Sometimes this is because I am irritable and sometimes this is because I expect that person to be sympathetic. This is not really fair to them. So I try to dump my anger in a journal (I always carry a small notebook around) and/or do my breathing exercises. Going on a walk or even pacing indoors also helps calm me down.