Check out Answering questions to break through a block by Scott Nesbitt. Here is an excerpt:
I don’t believe in writer’s block. But I do know there are times when you just can’t write. The words are in your head. But they don’t travel from your brain to your fingertips to keyboard to screen. You’re frozen.
When that happens, you get frustrated. That makes writing even more…
The full article is available here.