Quit whatever you are doing. No work for couple of months (may be even a year), only fun stuff like movies, sports, exercise, good food and may be even light non-work research if you are into it.

I'm actually in the same boat as you are and am planning to quit my job and do nothing, starting next month. Just gaze at stars from high altitude and realize that this world is big. Job and stress are small things that should not matter in one's life. Then one day you might wake up and find motivation to work less, earn more. At least I hope to do the same.