dizzy, unfortunately your son will have to go through some diagnostic testing to rule out other possible gi problems.The first one you might start with that is simple is a lactose Intolerence test. Then blood work and stool cultures for a start.I am personally not fimilar with Calpul, what is that?------------------Moderator of the Cognitive Behavioral Therapy, Anxiety and Hypnotherapy forum.I work with Mike building his websites. www.ibsaudioprogram and www.healthyaudio.com I also work with Mike in IBS clinical trials using Mikes tapes at an IBS research facility.My own website on IBS is www.ibshealth.com Please visit for accurate information on IBS.