Inner Gremlins

I found myself aimlessly flipping through the numerous tv channels that my rather overpriced Sky+ box and came across one of my favourite movies of all time, Misery.
Now I don't what it is about this movie but every time I watch it, I have the sudden urge to break out the laptop and start writing, it might be the idea of a crazed fan holding me hostage, I don't know. But what I do know is that sometimes the urge to write wins but then I end up spending the next hour either staring at a blank screen or typing out a few pages before the Gremlins that live in the far corners of my not so inspired mind start screaming "THIS MUST NEVER SEE THE LIGHT OF DAY! DELETE IT ALL!"

A little known fact about me that only a select few know is that I wrote a book about 4 years ago, it's never been published and probably never will be, I have considered writing a second draft of it but I have looked it over so many times that I just can't bring myself to put fingers to keys. I don't know if it's fear of failure or rejection, but I can't seem to get out of my own way. All I have wanted to do for the last 10 years is write. I always said even if only one person read and bought my book I would be happy.

Any suggestions on how I can get past the doubts and fears that have turned a passion into a chore?