This answer contains spoilers…
(view spoiler)[If I discover that my inspiration and energy has dissipated with regards to a particular project, I find it best to step away from the work for a moment. This seemed much easier to accomplish with painting, backing away from the canvas and looking rather than applying more paint. I might read over the work, I might leave be for days. This listening to the work or time spent alone is beneficial for both you and the writing. This is also a good time to experiment with other projects, other forms. When I've grown exhausted with a book-length manuscript and I feel that the muse has left me, rather than beat myself up over it I relished the opportunity to tinker with something new, poems or drawings, short stories. Or maybe this "writer's block" is a call to read, to fall in love again with the books that inspired you to write. In any case, if you find that your creative reserves have run dry, go easy on yourself and try not to force things. The muse returns, she always does, and when she shows up again you'll be glad that you're refreshed, inspired, and ready to get to work. (hide spoiler)]