Here is a little trick I have found that gets me past that 'stuck here and what do I do now' point. Incidentally, when people first hear of this, they poo-poo it. "Can't possibly work. I'm BLOCKED I TELL YOU!"
At this point, I tell them, what do you have to lose?
1) Take the last couple of pages you wrote, print them out.
2) Now, take a leap of faith and delete them. (you still have them printed out so you haven't really lost it! You've also backed up in several different places, right?)
3) Start where you have printed off, and retype it back into your document
word by word. Don't cheat and just paste it back in! You have to retype it exactly as it was written before and printed out.
Don't edit as you go. Just retype word for word exactly. The trick is to concentrate on the retyping, not editing.
4) Once you're at the end of the current words, you may find that you want to keep writing and the words will continue to flow.
When I do this little trick? It has worked. If in that small percentage of chances it doesn't, I know there's something else that's keeping me from writing but so far...yep, has worked like a charm
If you find it doesn't, well, what have you really lost? Just the time to do it and the ink and paper you printed on.
To save on supplies, I don't print it out. I split my wordprocessing screen with my novel-in-progress on one side and a blank doc on the other. I cut and paste the two 'cut' pages into the blank doc, delete them from my novel (making sure I have saved it elsewhere in the event of computer/electrical failure). Then in my novel-in-progress document, I
retype, since it's right there on the other half of my screen.
The theory is still the same. By the time you've finished retyping, your brain is freed from that glitch that held it fast and you should be able to just keep typing.
I've found this to be a big help, I hope you find it as well.
Good luck!