How does one go about finding a Sports Doc?

If I were trying to do it, I'd call the nearest big university and talk to their AD about who's around that is good.

There's got to be some running clubs in the nearby metropolitan area with contacts you could call and get a recommendation from someone they work with.

Find the guy or gal who works with university or professional sports teams. Could be a physician, athletic trainer, PT, chiropractor or strength and conditioning coach. Yes, sports nutritionists exist. Ed Burke is one in Colorado Springs US Olympic Cycling Team). Most general practice physicians know very little sports nutrition. Find the specialist. A good coach can be fantastic as well.