A couple of links regarding finding "fat friendly" doctors:

Tips on Obtaining Good Health Care
http://www.cat-and-dragon.com/stef/fat/ffp2.html

and, the Fat Friendly Health Professionals List:
http://www.cat-and-dragon.com/stef/fat/ffp.html

The list is arranged geographically, so it's not *too* much of a pain to sort through. I don't know if there's any information there regarding how friendly those doctors are to lower carb eating though. Anyway, it might provide a jumping off point for you. Good Luck!