It's really tough when that happens :(

I usually deal with that by setting ridiculous writing goals for myself like: today I need to open one of my docs and write 2 words. I can delete them tomorrow if I want to, but I have to get them down. This usually gives me a sense of accomplishment and like I'm making progress? Because before I had no words and, by doing this, I now have 2 \o/ And then that motivates me to add another 5 words or 10 or a full paragraph to my story :D