Glossy is NOT glossy.
Confused? Good. What we call glossy should be called "direct" or without change. The screen has a coating on it to block glare but otherwise transfers light straight out from through the panel no problem.
In the distant past LCD monitors could not be made without a fairly thick glare protector because the backlighting was expensive to make, expensive (in power) to run and not terribly effective. This caused the screen to wash out with even a little bit of light available.
What we call "matte" is only a glare protectant layer, rather than a simple spray/etched coating found in "glossy" screens. This glare layer is a thick peice of plastic that is designed to scatter light not going straight (or at least at greater than x degrees) through it. If you have ever put a glare protector on a CRT sceen, its the same thing only more effective. The benefit is that it stops reflections from appearing either on the outside of the screen, or deeper in at the lcd panel itself. It also helps with washout because it scatters the light evenly around, where washout will happen wherever the external light source is.
By adding a glare coating rather than glare layer, manufacturers were able to remove a bit that was sapping up to 20+% of the maximum brightness produced by the backlights. It also removes the "halo" of scattered light produced in the screen by internal reflections, which make the black levels look deeper. None of that is "fake" or "inaccurate", and in fact it is probably more accurate, at least can be with proper adjustment.
I could turn this into a 3 page discussion on light, but in fact I have posted that before. Search on my posts and look for a glossy vs matte discussion, and read. Talks about light and the colors produced. Unless your environment is one with uncontolled light sources that WILL affect your screen, get the glossy.
If you have headaches because of the screen, get a matte, but somehow I think your headaches are due to something else. It COULD be the refresh rate, and then no LCD will help, at least not until true 120hz screens become available on laptops.
Hmm, now that I think about it, I have to take back that last comment about headaches. I used to get terrible headaches when using this toshiba laptop I had (techra 9800 if I remember right). It had the WORST lcd panel I have EVER seen. Matte with a weird pink cast to everything. White was probably somewhere around 3500k, not 6500k. I tried every trick in the book to get better colors, but the monitor just couldn't do it. 6 bit without dithering...
Try to figure out why you are getting headaches, I think it might help you out, plus it could help out some people here. It could be that *your* lcd ( I mean the one your laptop alone and not that it is glossy or matte) has colors more out of balance than by design. If that appears to be the case, the only way to properly solve the issue is with a spider or some other way to measure the light being produced. Once you run the tests, take whichever color has the least amount of light while maxed, and reset the other two down to that level. This should balance your colors at the white end of the spectum. The lower ends are generally not so much of an issue, but you might need to bump the colors a bit to generate a proper color curve, the spider will help here. Plus then you could use it on your TV and friends tv to set everything PERFECT.
Might help out.