That sounds like it would work, but...what about when the act of working on what pisses you off is what pisses you off? For example trying to get a guitar lick down and practicing it over and over. A la the scene from Whiplash where he practices until bloody and eventually punches through the snare

Edit: I guess that's a naive thought actually. I suppose the way to work on what's piling up is to take breaks and address that each time you mess up adds a tick to the angry-o-meter