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Hello and thank you for using JustAnswer. Are you currently in treatment for your PTSD or have you ever been in treatment for PTSD before?
You may want to consider continuing with your therapy or perhaps trying something new in therapy like Eye Movement Desensitization and Reprocessing (EMDR) to help you overcome these cognitive effects from your PTSD. In addition, the use of a benzodiazepine has been shown to be successful in helping lessen any dissociation with PTSD, so this can improve your cognition too. So I would discuss with your doctor about these treatments to help you overcome your current psychological and cognitive issues.
Than you should get on a good medication regimen for yourself first to help lessen your symptoms so that you can go through with therapy.
I think it would be better to start you on a medication regimen to help control your symptoms and to stabilize you before you start therapy. In therapy trust builds over time, so you cannot expect to be fully trusting right away. I would recommend that you see a psychiatrist to help manage your symptoms with psychotropic medications and then when you stabilize you will be more in control of your emotions and be able to not lose control in therapy.