I know my mother would have said to stay home. How are you feeling? Have you decided what to do? I would probably go and try to ride if there's SAG. I think drinking sports drinks would be good, because you're probably at risk for dehydration from your symptoms, but maybe small sips often rather than downing it. Also water if that's been helping.
I hope you're back to eating again. It would be pretty hard to ride if you haven't been able to fuel. You might be too weak. Play it safe! Edit: Do what sounds fun! If going sounds gross, don't do it.
'02 Eddy Merckx Fuga, Selle An Atomica
'85 Eddy Merckx Professional, Selle An Atomica
'10 Soma Double Cross DC, Selle An Atomica
Slacker on wheels.