Are a common symptom of Posttraumatic Stress Disorder (PTSD). In my case, it was hoped I would grow out of them. I haven’t, they are something I live with. I go through phases where they are comparatively benign, and others where they are so severe I can’t, and don’t want to, sleep. At the moment, I’m going through a bad phase. I painted this ink picture the other day. This is how it feels.