Hi, I ve found that when I wear glasses I get this excruciating headache mostly behind both of my ears. The second I take the glasses off the pain starts to go away. The longer I wear the glasses the more intense the pain gets. The pain is so bad to wear I have to stop whatever it is that i m doing. What is the cause of this? I have no known allergies besides dust, pollen etc (the normal things). Help!?