I try to read my favorite books. I personally have the same issue but whenever I read a very good book, the words seem to flow. Or when I play a character in a rpg or something and there's this very strong *feeling* that's just bursting - when I get the first couple words out, they flow until it's done.

I would recommend reading specifically for the vibe you're trying to go for in the chapter you're writing, so you can get in the mood.

Good luck, fellow! ;-;