P.M.
I have volunteered a few times to shepherd an autistic boy in my religious community, V., so I have at least a hint of what you are coping with. I don't have enough experience to offer you advice, but I have had as my personal physician a terrific doctor in Oregon City who has been specializing in autism from an environmental/whole body point of view for several years.
Dr. John Green III is a warm, gentle person with a knack for listening and a heart of gold. If you are less than confident in your current pediatrician or would like to expand your support team, you might consider contacting Dr. Green. (I don'lt know if he's accepting new patients at this time.)
Here's an article he wrote that will give you a sense of his philosophy: http://www.autism.com/treatable/recovered/drgreen.htm
I wish all of the best to you and your family.