I have seen and personally had some wonderful success with high quality cbd oils. Personally just for quelling and holding back anxiety attacks, which I know are markedly different from a ptsd dissociation, but I also have a partner and friends who have suffered from sexual trauma that has lead to PTSD. I think in tandem with grounding techniques like Gus goes over above, it can really help. I believe that is due to it suppressing cytokine production which reduces inflammatory responses in the body and the brain