You have to pace yourself, like an athlete with an injury doing slow small exercises before returning to marathon running.
Revising is as individual as writing. There's no wrong way to do it, and there are no hard and fast rules about how it goes.
As with writer's block, what's getting in the way of self-promotion is not practical but psychological.
It is so important to be able to play with one's creative work. And the more your livelihood or identity depends on creative production, the harder that gets.
The way you feel isn't a rational response to a defined situation, and can't be evaluated on that basis. Feelings don't stay contained and orderly. Some of your feelings may not even be about your writing.
If you still want to write even after you let go of any feelings of being obligated to write, take some time to think about why. Are there ways to access those motivations and keep them in the front of your mind so you can gain some satisfaction and joy from them?
Let go of any inclination you have to identify with your work and interpret critiques of your work as critiques of you. Critiques of your work are critiques of your work. Your job is to use them to make your future work better.
Nothing gets in your way more than a creative writing degree and a lot of practice doing other kinds of writing, both of which fill your head with all sorts of ideas about what writing should be like.
If you're feeling the urge to go back and fix (or despair over) what you've written already, and if it's getting in the way of powering on toward your goal and your deadline, this post is for you.
Do your best to get away from "I should be able to do this" and bluntly examine whether it's a good idea for you to do this.