Now I know why I frequently have a migrain by the end of the afternoon:

Head Pain at Work? Check the Lighting:

[…]Unfortunately, the problem with fluorescent lighting is different and more difficult to address. Although generally imperceptible to the human eye, fluorescent lighting has a flicker. It’s the flicker itself that’s actually a Migraine trigger. Thus, it doesn’t matter what kind of fixture houses the tubes. People who are sensitive to that flicker will have a problem with it.

I can’t do much about it, I can’t turn the lights out and leave people working in the dark, and there are no auxiliar lights either, like desk lamps. Maybe the option is to use a cap to protect my eyes from the EVIL LIGHT FROM ABOVE :).