I’ve said it before and I’ll say it again: be kind to yourself, especially during something like NaNoWriMo. Did you remember to drink water? No? Take a few swallows. I need to do that right now myself. Did you rest well? If you’re caught up on your words, take a breather– you don’t have to sleep, but taking five or ten minutes away from the computer or journal you’re working with can do loads of wonders.
Not completing NaNo isn’t the end of the world. And NaNo isn’t over yet, anyway. Pace yourself, but don’t burn yourself out. Procrastinate when you have to. Take breathers. Remember to give your eyes a rest– reading, and by proxy writing, stresses the eyes.
And don’t forget: Every word you have written is a victory on its own, one word you didn’t have before.