I wrote many letters that I never sent. I threw stuff...not at him...but when I was out on the trails alone and no one could get hurt. I vented to other people. And then I read a book about anger and forgiveness, and it allowed me to change my perspectives on the situation. Doing that has allowed me to let go of the anger. Working the 4th step also helped a lot - looking at my resentments on paper.
And lastly, not to minimize your anger right now because anger is an important part of the process...this too shall pass. Hang in there!