I can say I used to be that very same way. I could just feel the rage wash over me like someone threw a bucket of water on me.
Come to find out my problem was I was going through Premature Ovarian Failure. It really messed with my hormones alot.
It could be something medical wrong with you too.
I hope you can find out because being that angry is definately not good for you (or the ones that are around you).