There are a bizillion writing exercises in a bizillion writing textbooks designed to break through writer's block. Try brainstorming, freewriting, clustering, or any other technique. As long as your are writing, it doesn't matter what you are saying. I write letters to friends and other writers telling them how much trouble I'm having getting my writing done. Not only does this get my brain working, it keeps me up with my correspondence and entertains my friends.
Writers love to know that others are struggling too.
And, with the development and popularity of Email, there is very little pressure on formality. At least you are writing. Below is a list of possible ways to break through writer's block. Give them a try and see if you can't get back on track. Change your surroundings.