Based on the symptoms experienced lately, I'll give the top remedy first followed by other helpful remedies:
Arsenicum album: Vomiting and diarrhea at the same time with intense weakness/prostration. Generally chilly, could get visible intense chills/shaking when symptoms are worst. Thirst but vomits after just drinking even a little. Sipping warm or lukewarm drinks generally goes better on the stomach than cold drinks. Stool/diarrhea is very offensive/smelly. Symptoms are often worse in the middle of the night, 1-3am. Urine is dark, brownish.
Veratrum album: this is the classic remedy for vomiting and diarrhea at the same time. Usually this is used for food poisoning but can be used for flus as well. Forceful vomiting and diarrhea. Same chilliness. There is thirst for cold water and craving for sour things.
Pulsatilla: great nausea and desire for company/comfort. Not thirsty even with severe diarrhea.
I hope you don't get this flu, but in case you do...keep these remedies on hand!