So briefly explain my situation:
I work a lot with the pc, but recently for a few weeks my pc monitor is bothering me, when i sit in front of it for 1-2 hours at a time, i get pain in my eyes and a dryness. The interesting thing is that I do not care about the phone or my laptop at all, no matter how long I use it. Have used the monitor for several years before and was always happy with it.
I think that's not the monitor. Since the many screen work slowly makes itself felt on the body.
Try to adjust the screen settings, brightness, color etc.
You do not notice it, but you wink in front of a screen less, so the eyes are dry.
Get eye drops for screen use, which help against dry eyes, or in between wink on purpose.
Set the screen as far as possible from you.
A monitor can't be "bad", at least not in this way.
For you a "PC glasses" would be something or just the night mode of Windows.