Don't be stressed. Before you write, get to know your characters. Think about what they might do, in any given situation. Also come up with good plot twists. Good Luck!

Writer's block! Not an unknown experience to anyone who chooses to write a story and fall through with it!

Prepare for some thoroughly unhelpful advice here...

The writing experience is unique to everyone who tries it! Some people choose to plan out their stories scene by scene, detail by detail. Some people just make a rough outline. Some people just write what comes into their head. I have somewhat limited patience at times, so when I try the first option it never gets done. Usually I go with the second or third to plan out my plots. Characters of characters just sort of pop into my head, and if they turn out to be boring I work on them. I go on a website called Behind the Name for character names.

I could go into way more helpful detail, but here are several tips that might help you in particular:

1. Keep writing

Your writing skills haven't disappeared from the face of the earth, they're just a little reluctant to come out right now. So even if what you're writing seems horrible and stupid, keep doing it. Write anything at all. If you're really stuck, skip ahead. But don't give up!

2. Edit later. Write now.

Once you write out a perfectly awful first draft (which I'm sure you won't though it may seem so to you) you can fix it. It might

3. You don't have to start at the beginning

In all my failed novel attempts, I've seen this as a major pattern. I mean, it's really logical to start at the very beginning (it's a very good place to start!) but often I spend so much time banging my head against the wall trying to find an intriguing beginning that once I get past the first chapter I'm really tired of it.

4. Don't worry about the word limit

Work on just writing things down for now. When you go back and edit, make longer descriptions and conversations, maybe add a sideplot. This will give you more words. But for now, don't worry about it!

_______________

I don't know much about NaNo, but hope that helps! 

My brother and I are constantly giving each other critique on our novels (well, especially me on his... I'm really secretive about my writing!), so if you gave me some more details I would be glad to give you more specific advice. If you'd prefer not to, that's fine-- I completely understand!

Also, check out the book Writing Magic by Gail Carson Levine. It's an enjoyable read with helpful advice and exercises.