DS 7 has had diarrhoea for a week, I took him to the GP today, I have to collect a stool sample. Tonight he said his tummy hurts when he eats sugary things, could this be sugar intolerance? And if it is, what do I give him instead of bread? He's required to take a healthy, filling snack to his after school activity, up until now he's had a tuna sandwich. Also, I've absolutely no idea what to give him for breakfast.