Writer's Block.
God, I know, right? Isn't it the worst? No matter what you're writing -- whether it be a book, script, story, poem, novel, ESSAY -- it's a writer's worst nightmare. Looking a the page with no idea of what to put down next. The ideas, the words, they're all there...but they just won't come out the way you want them to, if at all.
There are lots of suggestion to fighting writer's block. Read. Get away from the project. Do something completely unrelated. Try another project. Do they work?
Maybe.