I believe that PTSD is also caused by issues with responses to environment - noise, people and other things. I took my kids through Sensory Integration for ADHD and it really improved coping skills. It is a biological response, and there are movements that do help. The best one of the day was in Houston, but there are other PT/OTs with that experience. I remember it being referred to as a vestibular problem - biking, swinging and other movements requiring balance were beneficial. Alcoholics also may have the issue and are self-medicating to feel more in balance with their lives. In the late 80s, they thought just children benefitted, but it IS useful for adults. Here's one organization: https://occupationaltherapychildren.com.au/we-have-skills/what-is-sensory-integration-therapy/