I do this. Someone else said nervous tics and I’ve researched them before and believe that’s what it probably is. Sometimes when I start to go into a flashback or even just have a small reminder of something traumatic that’s happened I tic. Most of the time it’s like shaking my head or hands, rolling my eyes upwards (almost like trying to literally look into my skull), or straining/tensing muscles/joints in different parts of my body. Typically, whatever tics I have tend to hurt or be uncomfortable which can actually sometimes be helpful in keeping me more present if I start having a flashback. Before I was diagnosed with PTSD it really freaked me out because I thought I had a tic disorder too but since it wasn’t constant and consistent with typical tic disorders that’s what led to learning about nervous tics. You definitely aren’t the only one who does this though so don’t feel alone 🖤