If you are having ongoing difficulty with treatment resistant OCD & PTSD then you should be under the supervision of a Psychiatrist for all medication related matters (not a family doctor). Also, the recommended treatment approaches for both OCD & PTSD include Cognitive Behavioral Therapy (CBT). In fact, medication of any kind is not recommended for the long term treatment of PTSD. While medications may be used to suppress/reduce trauma related symptoms treatment should consist of CBT. CBT is usually offered by Clinical Psychologists (although not exclusively) and you should also be receiving assistance from someone who is a CBT trained therapist.
Has your existing doctor/health care provider discussed CBT with you?
You are welcome. Your best bet might be to find a Psychiatrist who is also trained as a therapist in either OCD or PTSD, as this will mean they have a special interested in the area. AN organization like the Sidran Institute might be able to help you locate a Psychiatrist who specializes in PTSD. The Sidran Institute maintains an excellent database of Trauma services in the US. They You can contact them here.
Best of luck!