I don't get a writer's block. I write everyday on various subjects and have been done so for years. One of Ian Bank's advices was to: "Practice, Practice, Practice." So, I have, but not only on the art of storytelling as every bit of writing you do, you make yourself better. Therefore, I write, I blog, I research and share information all time.
If I have a problem on the story, then I keep writing the same pages time and again until I'm happy. Ian Ranking's calls it "the page 67 curse," and the only way to get over it is writing.