I deal with writer's block a couple of ways: 1. Keep writing and try to write through it. 2. Think of the absolutely most unexpected twist you can - write it and see how your characters react. 3. Go back to whatever section doesn't 'feel' right. Sometimes, a plot twist can lead you down a wrong path and if you back up and go right instead of left, things start flowing again. 4. I always have several books in process. If I'm really stuck on one, I'll switch over to another WIP and work on that for awhile. 5. Sometimes it helps to take a break and read something you love.