Here's an account of a doctor who specializes in difficult diagnoses. Note that he has to avoid insurance in order to spend enough time to find out enough--the article says that doctor's visits are down to 12 minutes. I was horrified enough when they went down to 15.
I'm surprised and/or horrified that celiac is still considered a difficult thing to diagnose.
I'm not surprised that, unlike Dr. House, this guy isn't obnoxious.