I had some sort of gastroenteritis over the weekend and I found Domperidone helpful but I don't think you can get it in the States?. (No one else in my family caught my infection so I think it's unlikely that it was norovirus and was milder).

I have prochlorperazine that I'd also consider taking if I had norovirus as I read a study (okay, it's not good to base your behaviour on one study but still...) that said prochlorperazine was more useful in preventing vomiting for people with SV in hospital than ondansetron (even though ondansetron/zofran is considered to be a very potent anti-emetic and is even used to treat emesis from chemotherapy and following surgery).