"What a strange feeling to be done with [writing] The Book. It had weighed so like a stone these many years, you'd think I'd be tripping about in ecstatic jubilation. But I felt rootless. Empty. Lost. I sunk into a slough of discombobulation."
"I sighed. It just might be that The Book was unpublishable.
wasn't feeling sorry for myself. I had gotten the job done, I was proud
of it ... Besides, I had found myself through the arduous writing
process. Even if we were never able to publish our book, I had
discovered my raison d'etre in life, and would continue my self-training
Both of these are from Julia Child's My Life in France, and capture pretty well some of the emotions associated with finishing a manuscript and receiving early rejections.
Been there, done that. Probably most writers have!
(By the way, "The Book" she was referring to is Mastering the Art of French Cooking, which not only did get published, but became a classic in its field.)