I believe PTS is curable, because I once had it, and I have not had any symptoms of the disorder for about 3 & 1/2 years. My life situation has not exactly been stress-free during this time.
I REALLY want to word this to the best of my ability, so that I can relate my experience.
There were 2 phases:
1) I tried to learn to play a stringed instrument for 20+ years, but I never really caught on to it. Then, in late dec 2003, I started playing left handed. Almost from the start, I was aware I "felt different", but I dismissed it at first. I continued practicing right and left handed daily, believing it was going to improve my musical ability. After 3 months, in March 2004, I made the connection. My mind was clear, I was not having uncontrolled flashbacks, my mind was not spinning out control, and I really just felt good. I even told my wife I no longer had PTSD. But that was just the start.
2) Whithin a day or 2 of making the connection, another process started. When I awoke in the morning, I could feel a POWERFULL AND PROFOUND process occuring. It was like floodgates opening between right and left brain. So I would just stay in bed, and let it happen.
Even though previously it had taken a while to make the connection, I understood what was happening in this case, right away. I made arrangements at work to work a slightly different schedule, from 10am - 7pm, instead of 8am-5pm. I could wake up, but stay in bed for an hour, in order to let this process continue.
Then I practiced right handed for an hour, lefty during lunch.
This continued for about a year. My belief is that REM sleep also plays a major role in what I am describing.
In this thread and many other threads throughout this forum, it is acknowledged and understood that there is an "imbalance" in people who have PTSD. It is conventional thinking that this is irreversible, and in fact, except for my experience, there is probably little scientific evidence to suggest otherwise.
But this DID occur, with me, in my case.