Audition burnout, normal part of the process?

I've been working with a coach and practicing at any available hour for the past year+ to win a job, but not only has my progress stalled, but random health problems are starting to set me back.

In the past burnout has just been a normal part of the process, and I wouldn't be worried about feeling strained. Heck, my peers who are now working in orchestras often described the dark places they had to go through in order to be winners. But insomnia, brain fog, and headaches are getting in the way of practicing.

If I'm not the most talented I am committed to being the hardest worker in an audition roster, but there are days I just want to quit because I don't get feedback on why I don't advance. I don't know if I'm putting enough effort in, need to swallow my pride and double down, or take an occasional afternoon off.