See, it started last year with headaches. These weren't ordinary headaches, but crippling-can't see-eyes-hurt ones. I had bloodshot eyes and wanted to keep them closed all the time to keep my head from feeling like someone had just dropped a brick on it. So I went to get glasses. Fat lot of good they did. The headaches went away for a while, but then they came back. I changed desks twice since last April, and even switched to an LCD monitor to reduce flicker.
Finally, last week I got fed up. These headaches only happen at work - I can stare at the computer all day long at home and not have a problem. So I finally figured out what the difference is. My desks with this company have always been interior. I have no natural light and must rely upon the flourescents. So, voila, cause identified!
I contacted the facilities guys who brought in the OSHA experts. They measured the light with 2(!) meters. Seems it's fine, but I'm still broken. This seems to be a somewhat common problem, so they turned off one of the lights overhead. I think I may ask them to turn off one more, just so I can avoid the afternoon headache.
All of that to say that I woke up this morning with a headache-hangover and it's made me cranky all day.