Ever think it's your sinuses? I thought I had migraines for a long time, but it was actually chronic sinus infections. I'm allergic to sulfur and penicillin... not much I can take, but when I get one, my eyes hurt, head hurts all the way to the back of my neck, sides etc.
All the pressure also makes me very tired. Staring at my monitor is grueling. Only thing that really helps is darkness, sucking on ice cubes and anything cold on my head.