Out of curiosity Hades, when did this start with you (the nausea) by chance?
I only ask because I'm curious if its a later development in your life (because we haven't always had high Refresh Monitors, or Consoles).
I know for myself I had to adjust the blue light. But for my wife it was actually corrective glasses. She used to play CS:GO with me (and was amazing at it) and then at one point she had much the same problem with shooters.
However, after seeing an Opthamologist she got a set of corrective glasses and that has helped her immensely.
Yay it's not just meI notice immediately the difference between 60 and 144hz. I couldn't play Fallout 4 at 60hz when it first came out because it was too buggy past 60hz. The game felt so choppy. I love high refresh rates even my phone the OnePlus 7 Pro I have I can notice the smoothness going from 60hz to 90hz.
I can notice though it is harder from 120hz to 144hz. I haven't owned a monitor that has been less than 120hz for a long time and I will never go back.
I think my KDR is better but it is hard to test. Though I typically do have a higher KDR than my friends with only a 60hz monitor. I can tell very easily moving the mouse around if I am at 60hz or 144hz.
I know that humans do not see in frame rates but are constantly taking in information.
Pilot simulations have needed to go above 60hz because pilots could easily and accurately asses visual information far above 60 fps.