My tip is to try a low-light skin. Luminance: Plankican Locus is a really good example and I know from personal experience that it can be a big help if the game hurts your eyes. If that fails, I'd stop playing.
You could try playing at a lower resolution (window mode), turn off shader effects and or hit lightning.
When I first started playing I played in fullscreen with shader effects which can be severe from person to person. In my case it caused sleeping problems however it went away after a couple of months. It's up to you if you want to quit playing the game but if it's damaging your health you should find a solution to it as soon as possible to avoid further injury.
your body is telling you to stop. so just keep playing! you're a kid, you never listen in the first place, so why do it now? fuck your body, you dont care about that shit.