Ten Possible Explanations for These Damned'd Headaches.

1. Brain tumor. Don't get morose. It's possible, but probably unlikely. I think I would have them more often if that was the case. Plus wouldn't my personality change in some way with some aspect of my brain having pressure applied to it. Na, don't think this is the reason.
2. Pure unadulterated, unadorned exhaustion. Let's see. Last one was after I had been on a mad, crazy holiday for two weeks, on the heels of being up for two days straight, and including an all night shuttle vigil, followed by a three hundred and fifty mile drive to Charleston. The most recent one was after two weeks of working rotational twelve hour shifts, including shift swaps (mornings—erg!), also proceeded by two days straight awakedness. You are not sixteen you know. Likely.
3. Teeth. Confession time. I have not been to the dentist for a little while. Okay, for ffhhthhpmm years. Sorry? Fttmmshhhpnn. You aren't going to say, are you? No. I am not sure on this one. It could be the teeth that make my head hurt, or the head that makes my teeth hurt. Again it's not constant. Unlikely.
4. Golf Ranging. This is a long shot. Very long. Could my golf ranging—which, when you see it on footage, on a sneaky filmmakers mobile phone, is technically challenged—have caused a niggle in a shoulder which niggled my neck which niggled my head. All of those things happened. Last week. If this was the cause, it was a delayed effect. No.
5. Ultrasound frequencies from Alien aircraft. What? Is this less likely than the tumor. Why do so many people suffer debilitating headaches these days? Are you going to say .... don't say! I won't have anything to put in the rest of the list if you say. Not overly likely, but can't be dismissed.
6. That strange throbbing sound, when it is quiet enough to hear it, like there is a generator just behind me wherever I am. Possibly, this could be a result of working with headsets. A sort of residual drone from having madmen and the desperate in my ears. Alternatively, it could be the throbbing inherent with living in a city of millions, or a hydroponic marijuana lab at the neighbours. Maybe.
7. Invalidation of myself. Thanks Isabella. Apparently, according to a book Isabella is reading (You Can Heal Your Life by Louise Hay), headaches can come from putting yourself in the wrong, denigrating yourself, low self esteem—that sort of thing.  Gosh, I think I would always have a headache. Ow. Maybe it's true. You have to forgive yourself and the headache will go away. Likely.
8. My hair. I have had no hair for four days. I have had no headache for four days. Could this be just coincidence? Seemingly very likely.
9. I was going to say seafood, or tomatoes. But I think maybe relief would be a more likely candidate. The other day I was very tense about the thesis. (Actually, the thesis is probably the main reason.) I then received two emails: one to say the topic didn't seem to be too bad in the scheme of things (from my supervisor who I was afraid would hate it), and, one to say the assignment deadline was moved a week back. I was so excited that a dance down the hallway may have ensued. This was followed by a rapid migration of the tension from all parts of my body into the nerve cells of my brain. Obviously they don't all fit there because a twelve hour headache also ensued—through which I had to work, speaking to the public. Six headache tablets couldn't budge that one—no, not six all together. Possible, but a thorough survey of what happened prior to the headache would need to be done. The dance may not have helped.
10. The evil eye. Possibly. I think there may be some people who don't like me. Possibly because they suspect I am monopolising the time of a certain person whom they all seem to fancy themselves. I wouldn't discount witchcraft. Fifty-fifty.