Yesterday, a couple of mindless kids attacked me at my workplace. Security later told me that I was one of three random people that they tried to start a fight with. I handled it somewhat well to the extent that I did not engage them physically - but then, I have never been a fighter.
But, I was shaken during the entire encounter during which a whole basket full of words were exchanged. They assaulted me three times, but I kept my hands to myself for the simple reason that I know what could happen should I allow them to experience the full brunt of the creature that is sleeping inside me.
Now, 21 hours later, I'm starting to experience feelings of depression and anger with myself for not just letting the issue go. So two questions arise:

1. How can I stop these feelings of depression and anger toward myself for not letting it go?; and
2. I recently read something that said that one can utilize anger to convert feelings of vulnerability and helplessness into feelings of control and power. Is there some way that I can utilize anger in the very moment to convert feelings of vulnerability and helplessness, and thoughts of violence, into a sense of absolute power (control of the self)?