I know that feeling when you just can't anymore. With me it wasn't directly because of a job, but I had a phase where I constantly felt overwhelmed and noticeably went downhill. What helped me back then weren't so much the classic self-help books, but rather stuff where I recognized myself as a person. "Man's Search for Meaning" by Viktor Frankl is relatively short and not hard to read - it's less about burnout management and more about finding meaning, but that was personally liberating for me. And honestly, a good book just to switch off also helped, not necessarily one about the problem itself.
If you want something more practical, I've heard that a lot of people do well with "Burnout - The Cost of Living" by Matthias Burisch, but I have no idea how current that still is. As for novels, I can't really tell you much there, I honestly had to pass on that one - it probably depends on what direction your taste goes. But what I think is important: also pay attention to whether you actually need a book right now or more of a break. Sometimes reading itself becomes pressure when you're already this exhausted.