The Best success ive had has been CBT so far..i have found no medication to help with the flashbacks at all. I cant be on SSRI's because they trigger my Bipolar episodes so thats not even an option for me. I recently tried Lifespan Integration Therapy with my therapist but i couldnt handle it yet at this point. Simple CBT seems to be the only resource ive found to work on my end, Good Luck!