It doesn't sound like OPs current burn out is specific to this one job. Most people don't wake up on day 1 of burnout and say "oh man I'm burned out now." In my experience burnout creeps up over years and you only realize it when you can no longer cope.

If they leave this job for a new one they'll still be burned out, just like the last two times in the past year they left their job for a new one.

My advice is the same as other commenters, OP should seek professional help with therapy. There are other things that can help like meditation, but in my experience there's no quick fix.