The only thing I could recommend is to go in person and see different screens at a local electronics store to see which of those bother you. Moving up in frequency to say 120hz could solve your issues all together, dunno.
+1 if an option, this is by far your best way to try to determine what's causing the problem. Try sitting/standing in front of a 120Hz refresh rate monitor (3D monitor - even if in 2D mode) and see if its any less harsh on your eyes. You can also get "gaming glasses" I believe, kind of "gimmicky" but they actually reduce the brightness on your eyes and supposedly reduce eye strain. Again, worth a try - your eyes are important