Check out this interesting post by just published by Helen Sword called “How Academics Survive the Writing Grind: Some Anecdotal Advice“.
One of the things in the post that most caught my attention was this:
Of all the myths surrounding academic writing, the fallacy of effortless productivity is among the most persistent.
Don’t get down on yourself when the text doesn’t magically write itself. Just keep at it, and try to find joy in what you are accomplishing, even if some moments of the task at hand are frustrating.