I found this page and it has some excellent tips on catching up on NaNo. I'm still at 19000 words even though I should be at 33333 today, and while I know that chances are most people will have given up by the time they're this behind, in case you aren't, take a look at this page:
This is a message to all you out there. You don't have to be the fastest writer. You don't have to write 2000 words in one sitting. But if you put your mind to it and really love your project, you can and will get further along than you ever thought possible. — FireEyes