Maybe try a different doctor. I was with a psychiatrist before that devoted no time for me, and just wanted to keep switching my meds around. I was on 300mg of seroquel, 300mg of effexor (yeah she didnt realize the max dose was 150mg) lexapro (i cannot remember the dosage) and 10mg of abilify. This made me overmedicated and a nervous wreck.
I finally decided enough was enough and went to a GP i trusted. He got me stabilized on 100mg of zoloft in the morning. 3x .5mg a day xanax (as needed...I only use it when i really need it) and 30mg temazepam for sleep. He also suggested therapy which I do to this day. It is incredibly helpful. I go the opposite direction than you. Whenever problems build up I don't rage, I shut down, or have a panic attack.
I feel for you. PTSD is incredibly hard to treat. I would look around for another doctor, and maybe try a shorter acting benzo that you only take when you need it. I know I will be on xanax for life, as it is the only thing that quells my panic attacks, and I know I will be on a sleeping med for life. I have never gotten good sleep due to anxiety (when I am in bed it is the worst, I just keep hashing, and rehashing things that happened to me, sometimes reliving them. I was having intense nightmares as well. The temazepam puts me to sleep and I don't dream anymore)
Goodluck, please let me know how this works out.