Check out Rob Walling ( http://www.softwarebyrob.com/ ) if you haven't come across him yet, his book is subtitled- 'A developers guide to launching a startup' and it was eye opening for me (market first, marketing second, THEN build actual product). His podcasts called "startups for the rest of us" have great tips about overcoming and transitioning and I find are very energizing knowing others have gone through similar.
Every case is different, best of luck!