Doctors will believe in an allergy, but most do not believe in Intolerances, though I'm not sure why. An allergy is easy to test for, while Intolerances are different, they don't affect the immune system. My family doctor and my ped, and even my allergist, tried to convince me that milk/soy wasn't a problem, until I proved them otherwise. Is there any way you can ask for a different Ped?
I would be tempted too to try the soy, as there are so many options with soy milk, yogurt, cheese, etc. For rice milk there are also many options, rice milk does contain the same amount of calcium and Vit D as cow milk, I do believe, but it lacks in fat in protein. There is a sticky thread on ways to increase fat and protein into the milk. Here is the link:
http://babywhispererforums.com/index.php?topic=127677.0 For myself I added 1-2 oz of coconut milk, found in the Asian section of the grocery store, for fat and had to buy powder protein to mix into the milk. You can find rice milk that contains more fat, same with Almond milk I believe. They are all found in the organic section of the grocery store, some are on shelves and some are in the cooler. There is also rice cheese, and baked goods, as some regular ones contain cow's milk.
Here is another link for foods that contain a lot of calcium:
http://babywhispererforums.com/index.php?topic=139773.0For us the symptoms started to dissipate in one week, they were completely gone by the fourth week. Their behaviour should increase, like others mentioned, my son was so miserable before, and now he's so happy and eats like a pig, seriously! Hope things get better for you.
Here is another link to our sticky thread with a list of names that soy and dairy go by, so you know what to avoid, as many have hidden names.
http://babywhispererforums.com/index.php?topic=66236.0