DS - 17 months - started vomiting with bad diarrhoea on Sat. Couldn't even keep water down so took him to OOH doc on Sunday. Told us he has a double ear infection, to keep him hydrated and to treat discomfort with Calpol. No change on Monday so went back to doc as worried he'd kept nothing down for 3 days but sent away with same advice. Yesterday he was perkier but did 12 liquid nappies. Today 3 liquid nappies so far and a massive spew after he managed to eat a bit of weetabix. Do I just ride it out? How long do these things last?