I deal with that a lot, too. I have a lot of aggression. I work on focusing it. It hurts so much just to stop playing repertoire and working on simple exercises, just letting go of what you believe to be most important and just sitting down and doing one thing. It could be harder to do this, than to play repertoire, itself.
Maybe, you're angry because you are bored. You need a mini hobby inside of the piano lifestyle. For example, mine is the wtc 1.
Try something that is energy consuming, not overwhelming, and productive. Liszt 6 consolations?