Be aware that flourescent lights can cause migrains, if you work in an office with flourescent lights, try changing it to a normal light, see if it helps.
Also AVOID the cheap poor quality energy saving light bulbs.
I got one from the local pound shop a few weeks ago for my sitting room, I started getting REALLY bad headaches, chucked the lightbulb in the bin, and they stopped!
problem with the cheap energy saving bulbs is they give off a very slight, almost undetectable flicker, stick to good quality well known makes, such as Phillips or Osram etc.

If you have flouresecent lights at work, and they can't/wont change them, you can get coloured lenses for glasses, see a good optician for advice, even if you dont need glasses to see properley, you can get plain lenses, they are like sunglasses, but slightly tinted blue.

As with any medical problem, its best to try to see wahts causing it, instead of just taking strong drugs, ie for example, I'm allerigiced to MSG, its a food additive, E 621, and is used a lot in processed food, try to eat only fresh food, ie nothing processed or out of packets.
Or ask your doctor to do an allergy test.