You can give them their due later. Look at how much you've done to date, rather than at how much you have left to do. You have more done on your dissertation than you did yesterday, even if you worked only half an hour. By definition, this is progress. Join a dissertation writing support group in your department.
Students say the feedback is helpful and that they learn criticism is survivable, even useful.
The group can also provide some much-needed structure to the lonely business of writing. Respect dissertation writing as your job. It may be flexible and open-ended, but it's a job, just the same. Everyone who finishes a dissertation finds a personal strategy to keep themselves engaged in the long process of writing, thinking, editing, and revising. What suits you may be counterproductive to a fellow student.