Stay.

I don’t know what people are talking about when they complain of writer’s block.  Of course it’s difficult sometimes. So is anything. Just stay there until you get it done. And there are various little tricks you can use to get to your three pages. Sometimes, if the evening wears on and I haven’t written anything, I have resorted to a very, very large glass – a wine glass actually – full of gin. It works.

Philip Pullman