More commonly known as "writer's block", this condition (much like the hiccups) has many reported cures. Personally, a walk around the block in really cold weather does wonders, but in case you don't have access to a block or cold weather, try some of the exercises at Language Is A Virus. Here are a few choice nuggets:
- Using phrases relating to one subject or idea, write about another, pushing metaphor and simile as far as you can. For example, use science terms to write about childhood or philosophic language to describe a shirt.
- Systematically derange the language: write a work consisting only of prepositional phrases, or, add a gerund to every line of an already existing work.
Check it out and free your mind!