Writer's block is usually a problem with the story, not the writer. It feels as though you've dried up creatively, but that's because you are looking in the wrong place for the problem and therefore, can't solve it. Chances are it's not inside you. It's in the story. You've written it into a corner. The best bet is to go back a paragraph or a scene or two and figure out where things went awry. Be very clear with yourself about what your characters desire and what thwarts them. I see it like this: the story engine should drive itself. If it lost steam, you have to go back and fix it.