Unfortunately, there is no handbook and guidance for how to deal with stress during PhD. It seems to me that everyone has to go through this. I haven't encountered one student who was content and happy. But I think more can be done in this front from the department's side.

Supervisors even don't help, generally speaking, technically. They don't suggest readings, solutions, or correct directions. Still worse, some supervisors are not friendly with their students, which is the worst position a student can find himself/herself in (no progress, no help, and angry supervisors). All of this makes it very hard for PhD students to find a way out. I understand your situation, believe me, but you are not the first or the last one to find himself/herself in this situation. Just don't give up.

Could you give me a hint how your research is conducted? Like experiments, statistical, theoretical? and why are you stuck (I assume this is the cause of your burnout)? And are there Postdocs working in the same group who can help you? This may be helpful to PhD students, where they can work as coauthors with them, to set them off.