Are you plagued by nightmares? Do they haunt your daytime hours as well as your evenings?
A technique called imagery rehearsal therapy (IRT) has been shown to help some people who suffer from PTSD. According to a recent article in USA Today, IRT is "a form of cognitive behavioral therapy, which focuses on changing harmful thought patterns."
Basically, IRT teaches you to examine your recurring nightmares, then "rewrite the scripts" so that you are in more control of your dreams.
I actually did something very similar just this past week, without knowing it, to deal with the recent death of my father. Every night before I go to sleep, I try to set the intention for my dreams. My nightmares have dramatically receded, and I feel like my dreams are instructing me, rather than terrifying me.
Give the article a read and talk about this with your therapist. It could be worth a try.