For it to be cured, the brain would have to reform its original neurological state. That state of imbalance is what causes PTSD to be an ever present event within a sufferers life, ie. the symptoms can go away, yet they can also come back at any time under any amount of stress. The only way a cure could be identified IMHO, would be a study performed with before MRI's showing the neurological imbalance with hippocampal decrease, then after MRI that it has returned to its normal size and the neurological abnormality has gone.
MRI would be the only way a cure could be scientifically proven, and one person would obviously not be enough though to call it a cure, it would have to be a large proportion of a study group. Just my opinion though.... obviously that is up to doctors. Medication does not do any of these things presently, it only gives the brain the illusion of correct balance, not physically done. I know LRS your circumstances, and I still believe your circumstances need to be tested further in such a study.