OK, DS who is 18 weeks old, started with diarrhoea on thursday. Since then he has been having obvious crampy pains (babies are so obvious in their facial expressions aren't they? if it wasn't heartbreaking it might almost be comical) and extremely watery diarrhoea at every feed. He's feeding every 2-3 hours in the day (more than usual) and waking every 3 hours or so at night (usually he sleeps though). Today he's started being sick - properly sick rather than his usual possetting - with some degree of force. Mummy has had to change a couple of times today! This afternoon he has been quite listless and had a couple of long naps. I called NHS direct yesterday and they advised to give cooled boiled water and keep bf as normal, and that it may well be rotavirus and it could go on for about a week.
The question is, when do I start to get worried? he doesn't seem to be getting better, and if anything he's getting worse. I thought his fontanelle looked a little depressed just now before his last feed, but then he had a good bf and 120 ml bottle as well (wasn't interested in water after that), and it seems better now. It's horrible to see him looking so sorry for himself. People who have more experience than me, please tell me: does this seem like a fairly "normal" illness (IYSWIM)??