I am so sorry that your son's doctor is so ignorant about Bipolar. My son's peditrician was as first too.
The web site that I have found to be very useful is www.bpkids.org, it not only gives you information about getting a diagnosis for kids, but also lists doctors who treat children with bipolar disorder.
Also the book "The Highs & Lows of Raising a BiPolar Child" is a great resource.
Good luck, and feel free to e-mail me with any questions or just to vent :0
SCUROMOM@dc.rr.com