I have this problem as well. It stems from bad upbringing and undiagnosed disorders (I'm pretty sure). One accident leads to another and feels like a jolt to my nerves where suddenly I can't function or focus and my nerves feel like they're about to explode. Before I know it, I've had one to five spastic problems on top of each other which causes extreme frustration and rage, then the punching starts. I repeatedly punch the side of my face until exhaustion. What's worse it the embarrassment of being heard or caught which makes me hate myself even more. This leads to more self-abuse. Days like that, all I can do to avoid having an awful day is go to sleep.