Not to be insensitive but you've described all the problems and the solutions.

You're remote. You game. No hobbies. I don't think you mentioned your friends if you have any or not.

Life is going to suck for a while and you'll adjust from the breakup.

However, while you're adjusting you can lay the foundation for your new life by addressing the issues you already see.

I'll add to that, focus on sleep, focus on nutrition, and focus on moving your body in some way every day (e.g. walk, exercise, etc).

Good luck man.