It's difficult to imagine famed Harry Potter author JK Rowling doubting herself and her own work, but this is exactly what happened while she was writing the third book in the Harry Potter series, Harry Potter and the Prisoner of Azkaban. In fact, she got so fed up of repeatedly reading and checking her work that she got so "sick" of it.

"Finally!" Rowling wrote in a letter to her editor Emma Matthewson. "I've read this book so much I'm sick of it, I never read either of the others over and over again when editing them, but I really had to this time."

She wrote in a separate letter, "I am so sick of re-reading this one that I'll be hard put to smile when it comes to doing public readings from it. But perhaps the feeling will have worn off by next summer."

The Guardian said that this is but one of the many details revealed in the author's new bibliography called "J.K. Rowling: A Bibliography 1997-2013." It has was released in the UK last February and will hit the US in April.

Another fun fact from the bibliography was that Rowling considered alternate titles for the fourth installment Harry Potter and the Goblet of Fire.  These were Harry Potter and the Death Eaters, Harry Potter and the Fire Goblet, and Harry Potter and the Three Champions.

It also included a song made by Gryffindor ghost Nearly Headless Nick called "The Ballad of Nearly Headless Nick," which was unfortunately cut from the book as it was considered "superfluous to requirements."

JK Rowling's bibliography is over 500 pages long and is written by Philip W Errington, director for children's books at Sotheby's.

"There is a lot of incorrect information out there and this is a chance to set the record straight with detailed research," said Errington of his book. "I'm very fortunate that Bloomsbury let me into their archives, and that I was able to interview key people. This could act as a map for the future. You can see how the Harry Potter series just took off."