Anna, I actually agree with Christina that anger is often a side effect or symptom of depression. I've dealt with extreme anger in association with depression. One thing that helped me deal with the day to day symptoms was karate. I'm not saying you need to run out and join a class per se, but if there's a gym you go to that has a heavy bag, punching the heck out of it until your arms are too heavy to swing is actually very helpful (and good for fitness incidentally). I've also chopped wood or just spent time throwing stones out into a lake. I realize these are probably all 'manly' sorts of things, but venting in this way can be helpful with the day to anger and take some of the edge off.

Going a completely different way - I had stopped playing music (the guitar) for a long time because I felt so lousy. But when I made myself play it again, I found it to be soothing and pacifying as well. I just had to press through my initial desire to do nothing to get into the zone. Lying in bed listening to music and occasionally screaming into a pillow isn't bad either. Maybe it sounds strange, but it all helps cool off the anger.