Well, nothing showed up on X-ray or MRI. I had my head examined dozens of ways, and several hundred dollars poorer, the pain eventually went away in late summer. I ran out of money, so I didn't pursue it any further. It started to come back a few weeks ago, and now it's really painful.
It's most likely a sinus headache. It has all the symptoms except the part where I deny I get sinus headaches, because I think it's imaginary. My left eyeball hurts to the point of tearing, and it's hard to swivel in the socket giving me momentary double vision. My left sinus under that eye hurts to touch, and sometimes my teeth ache. The back of my throat hurts like it's being stabbed and the inside of my nose feels try, itchy, and painful. I feel like I have a rash in the back of my throat, and it hurts to swallow because it's so swollen. I grind my teeth constantly, and my temple throbs with headache after headache.
Last year, the only thing that made it bearable was an alternating high dose of OTC ibuprofen and acetaminophen: 2-3 pills of one every 4 hours as prescribed. This is not a good idea, health-wise, but it worked better than any decongestant which I cannot take because my heart would explode.
The funny this is, the pain comes and goes. Like one minute, I want to die to avoid the pain, the next, everything feels fine. It's worse when I sit or lie down, and doesn't hurt much at all when standing or walking. It's much better at home, usually okay at work, but outside? Shit, I want to stab things. And it's REAL bad outside in Virgina (where I live) as compared to Maryland (where I work). The pain moves around my head, roaming in certain ways. When it stops, there's some draining right away, and I think that's when the pressure pops.
It HAS to be allergies. But this SUCKS. I keep trying to tell myself the doctors said they couldn't find anything, so maybe it's psychosomatic, but... damn... it's hard to wish away pain that won't go away.