I think Marianne shared some very good ideas. Some more ideas are:
--hit a pillow or couch or bed that is soft so it doesn't hurt you
--go to a river or lake and throw stones in it
--throw clay down onto a wipe on/wipe off board that is laying on the floor
--twist a towel as hard as you can.
You did a great job talking about your anger, and it is certainly ok to be angry. Please feel free to come here and write as often as you need to.