It's really weird how much stress can do to a person. Years ago I was working for a small family-owned business. Unfortunately, the family running it was dysfunctional.
I started getting tension in my neck and at times, the tension would build up so far that my head would suddenly jerk to the right. Near the end, my head was jerking to the right A LOT. Folks must have thought I was out of my mind or something. (The voices are making me do this, heh heh...) So you just never know.