I knew it was time to leave IT when it finally hit home that:
1) the steaming pile of software we'd been asked to use to do our work was the "industry standard" and that I was likely to end up using it no matter where I went;
2) there was nowhere else in the company I wanted to move, qualified for the job or not; and
3) no matter how much time was dumped into the job and how much we "worked smarter not harder", we were still threatened constantly with having our jobs outsourced to someplace where people can live on $20 a day.
IT in large companies has long been a race to the bottom, and I just wasn't up to it. Fortunately for me, I had another income in the house and some options.
Burnout is very real. But, Rob, you need to sit back long enough and ask yourself what role you played in getting to this point. Do you find it hard to say 'no' when asked to work? Is it just an job that does not come naturally to you (maybe an introvert in a public-facing job, not having sufficient innate talent, etc.)? A lack of self-confidence that keeps you at the grinding serving jobs and not at the better restaurants?
I don't know the business so I don't know all the aspects of it. But I'll echo Yossarian's comment that moving to another industry may not fix the issues you see now -- in fact, you likely will have to start at the bottom of that industry, with all the crap that entails. I think you really need to have a good idea of why you dislike what you're doing now and determine whether it is fixable before you toss it all for work for which you have no experience or seniority.