Yea i think it was all then years of counterstrike damaging the eyes? Im like you the only thing i think looks sharp is 24 inch panels preferably doing Nvidia DSR 4k at 120hz plus i found 120hz isnt able to do it anymore so going 240hz again soon. Its just that little step up from 27 144hz that eases all symptoms like you had.
thanks, I might pick up a 240hz display to see if it helps.