My little man (19mo) has got viral gastro and has been having diarrhoea for four days, along with low energy and minimal appetite. He's lost a bit of weight in his belly and cheeks, so I'm taking him back to his doctor this evening, but just curious to see how long we can expect it to continue?

My DH also had it (both caught it at same time), but he has finally come through and is ok again.

Feel so bad seeing him so miserable!

Thanks in advance.