I hesitate to write this, but PTSD is a bit more complex than that.
In some cases there's damage to the hippocampus, which doesn't get better. I've had 40 years to make peace with the crappy accident I was in. But the things like an exaggerated startle reflex, an aversion to chaotic or unplanned sounds and other triggers remain. I always carry a pair of noise-cancelling headphones if I think I might need to be in a noisy environment.
You try propranolol yet? Worked like a slow miracle for me. It completely neutered the negative physical symptoms after some time using it combined with carefully controlled exposure to triggers.
In some cases there's damage to the hippocampus, which doesn't get better. I've had 40 years to make peace with the crappy accident I was in. But the things like an exaggerated startle reflex, an aversion to chaotic or unplanned sounds and other triggers remain. I always carry a pair of noise-cancelling headphones if I think I might need to be in a noisy environment.