it's stress, ask any doctor when you tell them eye twiching,,first thing that comes to mind is stress i get it too and at first i'm worried "whats going on" it's like someones got a fishhook in there and keeps pulling on the string...it is actually more common than we think just no one talks about it. not permanent will go away soemtimes mine last just for the day some time for weeks...it gets very tireing i know and a lot of times i'll sit there with my hand over one side of my face pressing down. i don't care if i look stupid.