Do you have a support group for your PTSD ? Support groups can help relieve some of that tension and anger you're feeling. I'm sure you wouldn't want to hurt yourself or anyone else.
When I'm feeling out of sorts, I do find that exercise does help. I used to do a lot of kick boxing. Found that hitting a heavy bag really helped vent my frustrations. Maybe boxing is something you could try to vent your feelings.
Do you blog ? Writing out your feelings can be very cathartic. You don't have to write these feelings on your Spark page, you could keep a journal or even a scrapbook. I know people who've created a scrap book with images and writings of how they are feeling. Painting is another way to reduce stress and let out emotions.
Recovery is never easy, but these are some things that might help.