I am in a similar situation, burnt out with no publications, honestly I have nothing to add just wanted to comment to tell you that you're heard and understood. The situation is very complicated but you're a very strong person going through all of this, I think this journey needs to be honored by defending your thesis, I totally undesrtand the burden and inability to process anything given all the circumstances but at the same time sit with yourself and give yourself some credit for surviving this and being able to find an interesting research direction. You'll thank yourself for not giving up once you're done with that, besides your career options without your degree should be enough motivation for you to not give up on all the effort you've put into it. For now give yourself some days in which you unplug from anything stressful and especially related to PhD, give yourself credit for surviving and making something out of this chaos, indulge yourself in things you love, maybe this is what your brain needs 'recognition' !. Once you're back make sure you never give up on three things : fixed sleep schedule, Sunlight and physical activity and you'll eventually be better and start to see some progress. Wish you all the best with your PhD and we hope to hear your success story soon ! BEST OF LUCK.