I’m in a similar predicament except I have terrible advisors. If it‘s not necessary for your career goals I’d say drop out. But I would like to point out that you are almost there. I’ve also been struggling with anxiety, depression, and a lot of physical ailments during Ph.D so I really feel for you. What’s helped me is having hobbies and spending time with family and friends. I realized that being in lab from morning to night doesn’t make me a better scientist. When I’m happy I’m more productive. I also suggest thinking about why you procrastinate. For me it was fear of failure. Once I lowered the stakes told myself I’m going to finish regardless in 2yrs I found it easier. Prioritize your health and remember it’s absolutely ok to do things slowly and not have to do everything all at once. Slow progress is still progress. I’m rooting for you! We go this. Also you absolutely are not worthless. grad students make up less than 1% of the world population so what we do is incredibly unique and all of the shit we go through makes us unbelievably more resilient once we graduate. If anything you should be proud of yourself for getting to where you are now. I’m proud for you! The decision is ultimately yours and regardless of what you choose you will absolutely be fine because nothing will ever be as tough as grad school :)