thats practically cheating! (being able to see more enemies) How do you do it?
in console. 80 is the max you can have in multiplayer.
or altering mp_config.cfg, adding or changing seta cg_fov"80"
"consoley" FPS games tend to set the FOV very narrow. Easier on the hardware that way too.
I still say the refresh rate -combined with your monitor's resolution capabilities- can cause headaches. The subliminal pulsing can really annoy your eyes if not set properly. I'm no doctor of course, I just play one at night.
Possible. Easy to check for: Try different resolutions and monitors.