The book The Artist's Way recommends completing three pages of stream-of-consciousness writing each morning to clear your head for the day.
Try writing those three pages, but focusing on your story. Remember, this is not writing that anyone is ever going to read. You're just letting the pen flow and seeing what associations come up. Think of it as a totally informal reaction paper to your story.
This exercise can bring to light central themes in the story, as well as why telling this story may be vital and/or challenging for you.