Well ultimately this could be turetts but lets not jump to that conclusion. I myself am slowly and deliberately blinking when I am outside. One of my cheeks flinches too and I am constantly biting and chewing on my bottom lip. I have begun chewing gum in public to alleviate these near constant compulsions. As for my hands, I am constantly rubbing between my thumb and forefinger despite nothing being there - people have commented on this. And so, when I am in public I always make sure I am holding something - usually a coffee cup or water bottle.