See the comment I just left on your post from yesterday -- do what you need to do, and don't under any circumstances put too much pressure on yourself!
614 more words than yesterday! You're doing great! Don't worry about the 50k words, you've got a lot going on. And as TA said above, don't put too much pressure on yourself.
Today I feel really good and I think that's partly due to the fact I didn't push myself yesterday to write more and after years of feeling crap, I want to feel good rather than push and push myself. I mean, I've already won nano twice.