I find that anger can make my anxiety worse, too. I would suggest learning relaxation methods such as progressive muscle relaxation, breathing exercises or mediation. These can help slow down you breathing and ease anxiety. Practicing before going to bed could leave you more relaxed and less likely to have the anger provoking dreams. There are a lot of examples on YouTube and various other sites. Here is the breathing technquic I use:
Take a deep breath in through your nose to the count of 4.
Hold your breath to the count of 7.
Exhale through your mouth to the count of 8.

I do this 10 times to relieve anxiety symptoms. It takes practice.

When you are concentrating on your breathing it is hard to pay attention to anything else. Good luck. I hope things get better.