It is necessary that PTSD is curable, no matter what anybody says who doesn't understand it.
Necessarily curable.
It's necessary that it's curable, because the brain damage didn't have a physical cause: WE are doing something wrong, compulsively, constantly, and when experiencing EFT, EMDR, other-hand-banjo, one-eye-staring, then our brain switches back to its normal functioning, and we are able to finally do the right thing.
The cause: a conflict.
Here's my assumptions on PTSD: when we experience the whole world falling on our heads, our hypothalamus orders us to immediately do something to stay alive. Just after that very primitive command comes the brain into the picture: we see just after the command that it is UNFULFILLABLE. Thus, a deep conflict occurs in us: we MUST survive, but we CAN'T. If you don't take that MUST-CAN'T conflict biochemically seriously, then you can't understand PTSD.
You have to know the fact, that memories are commands in themselves, chemical compounds which silently or loudly drive our neural pathways (command transmitters). That's why we have the trauma in very strange memory-fragments: because these commands can't be fulfilled, can't be interpreted, the defensive system simply can't do anything about them. Hypothalamus did it all wrong, it was a wrong, simply false judgement that "I must do something or I die", because there's nothing to do, I can do anything, but can't avoid the whole world falling over my head in that situation. The possibility of total annihilation is real.
The symptoms of that conflict are: PTSD.
But don't blame the hypothalamus, simply during our evolution we couldn't adapt to unadaptable situations, simply because it's impossible. Instead try to approach that must-can't conflict with your left, smart brain, which already can see the truth, and it can stop the wrong-doing of the hypothalamus. - So let's see, what's the situation in our brain since the trauma?
Our right brain (the more instinctive strategies with which we need to react immediately) fires, fires, fires, but in vain. We don't even know what is happening with us, it is just firing all the time, causing hemispheric dominance problems, problems of control; I've discussed it above.
That conflict can be resolved.
And why helps those brain-focused therapies, even the most simplest home-made exercise? Because finally they involve the LEFT brain, which was totally out of the picture, the commands didn't even reach it (didn't really reach the right either). With that, normal, evolved brain functioning is restored, and you finally can see without compulsive avoidance (or: the symptoms of PTSD) that you really couldn't do anything, you have been raped, nearly died, abused, etc., and it's a totally normal thing. Because total annihilation exists. - You accept it. You free yourself from your own prison.
Thus, PTSD is curable.