I too have a sort of lip tremor thing. My lip sometimes starts twitching, then after a while just gets tingly then goes numb.
I finally had a doctor tell me that I was hyperventilating... That can also make your hands and feet numb too, and make you feel really spacey.
Ever since then, every time I feel my lip twitching, I realize that I'm barely breathing. So if I stop and try and relax myself and breathe correctly, it usually goes away. But you have to be careful not to over breathe, or take really deep breaths, because that can make it worse, or atleast it does for me.
I hope this helps!
