It's a tough spot. No doubt.

My best advice would be to try to get your doctor to take you back off work, or at least back your hours way down.

You have to listen to your brain and your body. This isn't something you can just "tough out" and get through it.

I was in a similar situation many years ago and it took me more than three months to get back to full time hours and that was after being off work for over three months.

Good luck.