My grandson is currently not digesting anything. He is on a gf diet (he has other bad allergies, milk, and egg) and has flourished till recently. For the last week, he has been having diarrhoea (smelly, pale), following a gastric bug. Help! Does anyone know what to do? Is there a good gastric specialist for children that anyone knows? He is nearly five. Any suggestions welcome. We live in Northampton, so Birmingham and London both accessible.