Jo-Ann
My son is most definately allergic to all dairy. He is allergic to anything that contains milk, milk ingredients, casein, whey, calcium carbonate etc etc etc.
Trust me you can have an allergy that does NOT show up on allergy tests. They do a prick test all that proves is that you have a physical reaction to the allergen, there is no test to show a mentally physical reaction, the only test is a Challenge test, where you remove all of what you think is the allergens and then try them out one at a time.

If you lived with a child that had these reactions from a food allergy you would certainly believe them.
This is the same reaction many of us still recieve from the medical community while there are many other medical professionals that support it.

Anything is worth a try when faced with a child with challenges.
Sally, Mom to Jacob 8 (Bipolar-Resperdal 1.5 mg/day 100 mg 2 x day and .50 mg at noon and Ranitidine 150 mg 2 x day (for his appetite) and Vitamin E in the morning, Ben 9 and Max 2