Consult legal counsel about your situation, and your options for taking legal action. This is where the issue of breach becomes relevant. A publisher may ignore an author’s personal claims of breach, but may pay more attention if an attorney is involved.

I’ve tried a variety of strategies to keep myself on track (simple willpower, unfortunately, isn’t enough). I concentrate on email, blogging, etc. in the morning, and reserve the afternoon and evening for working on my fiction.