The last time my son ate clam chowder, he became ill several hours later to the point of vomitting in his sleep. When we took him to his physiciian for his annual exam, the doctor said he was not lactose intolerant.

He does eat cheese and drinks skim milk with his ceral on a daily basis. Usually ice cream comes into play more often than not.

However tonight he again had clam chowder and now he is claiming that his stomach hurts.... Is there anything I may give him to help aleviate the pain?
Secondly, I heard of the Hydrogen breath test - is this a standard method of determining whether or not he is lactose intolerant.

I appreciate your time.