I have my dissertation due in a few days. I have already finished most of it. But few days before submission, I always get extreme anxiety, like I feel that my work is not good enough and that I need to make it more perfect. I also have this habit of changing even one or two words and then submitting and resubmitting my work multiple times until the deadline. However after the deadline, I am at peace and I don't do anything as I know its not worth it anymore. How to get rid of this OCD/perfectionism? My grades at at borderline so that makes me scared even more.