If you can't even keep down water you may want to consider going to hospital for iv Meds and lays ration....
Sounds like a stomach virus. The flu is generally fever/chills/aches/respitory. I wouldn't wait long before being seen if dehydration is a possibility. Hope you feel better soon x
Well I also have a runny/stuffed up nose and sore that nd a little coughing and a headache
Def recommend going to the hosp for iv fluids and nausea meds