The three things that helped me in order from most to least: 1) Getting 8h of sleep a night. Without 8h of sleep sitting in front of a computer for a few hour

The three things that helped me in order from most to least: 1) Getting 8h of sleep a night. Without 8h of sleep sitting in front of a computer for a few hours would give me a massive headache. 2) Moving my computer from in front of a window to a different location. 3) Using blue light filtering glasses. Now I almost never get a headache, I think 1 and 2 were the biggest improvements. I've also started experimenting with having fake green plants around my monitors.