I’m reading The Icarus Deception by Seth Godin, and came to a very interesting passage, (p 165 of the hardback edition). Paraphrasing, he says you hear about writer’s block a lot, but you never hear about talker’s block.
The reason – we never stop talking until we are sure what we are saying is perfect. We just talk “without a lot of concern for whether our inane blather will come back to haunt us.” If you think you have writer’s block, “Just Write. Write poorly. Continue to write poorly, in public, until you can write better.”