I don't know what makes me angry anymore. I knew once, but I worked through the reasons for that and now instead of there being a clear reason there's just the sensation of tension that puts me on edge.
Simpler than that was understanding that some of my anger came from making decisions too late, or hiding from bad decisions thinking they'd fix themselves. Make good decisions promptly (good for you, good for the situation) and you'll cut your potential anger in half overnight.
The good thing about anger is that it alerts you to things that aren't working. You still have to figure out what is wrong though and then the pull of venting gets you more often than not. I found venting to be part of the anger cycle, I got angry (my own ignorance/fault) I didn't know what was wrong, time restraints and lack of immediate solutions caused me to overheat, and to avoid a total breakdown I had to vent. Fair enough, no one's perfect, but venting put me right back at the start of the cycle, ready for the next enragement. When I got to the point where I'd feel great after venting, that's when I needed to stop and assess how I became angry. Problem is, you feel so great and puffed up it's easier to forget. It's like some guy coming to a dance party who wants to play trivial pursuit. It's that much of downer, but it has to be done.
Losing the plot, lack of direction, knowing I have direction and not seeing it, holding onto outdated obsolete beliefs - those sorts of things work me up from time to time. But now the central cause is a mystery again. I'm like one of those movie characters that wonders: Why am I so angry? Now it's like bad is unavoidably coupled to good. Do someting good, feel great, then the tension arrives, mood changes, struggle begins. Like a door that's been left open and cold air blows into a warm room and I can't close the door. Anyone got a cure for that I'm all ears.