as shit as it sounds now. drop either your job or your hobby, neither it worth destroying your body for. the strain you put onto your body will put you out of either, the hobby or the job eventually. take a chill pill, do something else.
I'm not going to try to justify playing video games in a utilitarian sense - why should I have to? Everyone has a hobby, video games just happen to be mine, and hobbies aren't "harmful" or a "waste of time" as long as you're reasonable about it