Have you considered different glasses when using a computer? My computer glasses are diffferent from my bifocal prescription and my screen intensity is set at its lowest level, while my contrast is set sharp.

If you don't wear prescription, have you tried high quality polarized sunglasses or a CRT screen shield to mute the glare? How about different background colors and/or contrasts?

This is probably all old hat to you, but it would be nice if your problem was outside of your head and body as those things are easier to replace, and deal with.

Bountyhunter