[snarfy]

"Burnout is caused when you repeatedly make large amounts of sacrifice and or effort into high-risk problems that fail. It's the result of a negative prediction error in the nucleus accumbens. You effectively condition your brain to associate work with failure." -Isaac Yonemoto

You need to start having fun again, and quit trying to be successful. The success will follow. Chasing it constantly is a bit like chasing Moby Dick.