My 5 year son always remains ill. He sometimes suffers from stomach pains and vomits. And sometimes with viral fever cough cold allergies. Every time he is ill. He was a healthy child till age 3 but as soon as crosses age mark 3 he has started remaining ill. We are fed up of taking him to doctors again and again He has gone through many laboratory tests x ray ultrasound of stomach blood tests but no reason found out for his constant illness. Please help me to regain his health