I really feel for him. We've all caught the the bug from him but it's been less than 24 hours for us. For 5 days he's thrown up everything, even calpol and is clearly miserable.
Beyond offering lots and lots of cuddle time and water to sip is there anything else? He's sleeping all day, only waking to vomit and has refused food throughout. Thankfully he's been up for water. He's lost weight, he's very small for his age and just looks so miserable.