Take antidepressants, if your religious beliefs allow you to.
Get exercise. Daily. You have no idea how much this helps.
If you don't want to be an academic economist anymore, that's alright! There are countless jobs out there for Econ PhDs that are not academic. If you drop out now, you'll only have a Master's degree, which won't buy you much.
Finish your coursework, and speak to your supervisor about writing a thesis that will get you out in 4 years. Then go on the market and target the private sector.
Good luck bro. We're rooting for you!