I used to think that feeling angry somehow made me a bad person. But Anger is an emotion just like any other emotion. It has no right or wrong....what you DO with the anger.....that's another story.
What helps me is writing it all down in a notebook....like 20 minutes at a time of just getting it all out in big, bold, angry letters. It helps me release it all!!! (And beating a few pillows doesn't hurt, either).
I hope you are feeling much better soon! Hugs, HG