> Maybe the newer FPS games would be better for my brain

It might do. I recently had a bout of nostalgia and wanted to play GTA4 again (as a Uni student I only played part-way through without being able to finish the story). I ended up buying a used PS3 to play it, but I couldn't get through 30 mins of it before feeling nauseous. The low FPS on the PS3 just wasn't sitting right with me.

I ended up getting an Xbox Series S. The constant 60fps on this console was a game changer for me.