I recently splurged a few hundred bucks on a nice 21" widescreen monitor. The problem is, it hurts my eyes. I can't tell whether the problem occurs because the screen is glossy, the screen is unusually bright, or if it's something inherent in the widescreen itself. I have never had problems with monitors before, even very low-end ones.
My question is: have you discovered that certain monitors are comfortable or uncomfortable for your eyes? What characteristics cause the difference for you? Is there any monitor that you would particularly recommend?
If your monitor supports this, try dimming the screen's brightness and see if that helps. The reflection/glare will be intensified, but it won't be as bright. This way you can test to see if it's one or the other. If your eyes hurt more, it's probably the glare. If they hurt less, or just the same, it could be the brightness.
In either case, try a non-glossy screen so that you can really compare the differences and see which one is easier on your eyes.
As for the wide screen, I don't think it will bother you any more or less.