I saw you mention buddhism, but I'll still mention what sometimes works for me: praying the Rosary. It is the most calming prayer I know. When I prayed it in the hospital I told he staff that when I would pray, I would probably look like I was asleep, just to warn them. If anyone is interested I'll post a how-to link.

After the Rosary, the next best two things that work for me are psychiatric medications (much as I hate to admit it), and blackstrap molasses, which is rich in iron. If you are low on iron it is easier to get angry, I hear. I try to take at least a tablespoon/big spoonful a day.