Ok so for as long as I can remember when I'm alone I tend to have the urge to jerk my body or convulse. Also I click my teeth, clench my eyes, and hit my arms. This usually happens when I'm upset. I always seem to shake or jerk my body when I'm by myself and it makes me feel less anxious. I have always done this but I only just realized that it probably isn't normal. Any ideas on what it could be if it is anything? Thanks.