If you're any sort of professional, you'll probably come across great lulls in your career. I'd say it's almost inevitable for most, and it's easy to find yourself in a bit of a tailspin as a result. One good way to help you find your center is to ask 'Who can I help?'. Or, "Who is this for?'. This can help clarify what it is you do, and even more important why you do it. And take your own advice and do just that. Help someone. Even for free if you can.