Signs that I am stressed - the quick head shake

I need a quick head shake when I feel stressed - often when my human has stroked me too much and I need to regain my serenity. 

It's such a quick head shake that often humans don't notice it. Or they just think I am rearranging my fur.

But it's like the way humans sometimes wriggle their shoulders or do a quick sigh.  Or fiddle with their hair.

A sign that I want to get back to equilibrium. It makes me feel a little  bit better. 

I can't show this in a still photo - my human has tried and it is just too difficult. So she is posting a video at the end of this post.