Last Friday DS had a sickness bug that was going around the local schools and nurseries, all ok by Monday. No d&v since. He however has completely refused to eat, having only a bit of each meal, no more. He has visibly lost weight, as we walked across a car park this morning his trousers fell down round his ankles, twice. These are trousers he has been wearing for a while so probably were more snug than loose. He is drinking water and squash, not drinking milk. He has not had a fever since the d&v stopped. He appears fine and not 'Unwell' but is just refusing food, even crisps biscuits and chocolate! Have tried all of his favourite foods, no joy. He doesn't appear to be in any discomfort. Am pulling my hair out as I can see he is so much slimmer. Any ideas please?