Rest. Go to the doctor and get medication. My sister just had the flu and she took antibiotics and she recovered shortly after she started. Hope you get better. Also put a Vix in your room, eat cough drops, and nebulizer clears up your chest and prevents pneumonia. Food could irritate you but drink lots of fluids.
If I truly had the answer to that I would be rich; lol. Seriously though try drinking some Sprite or Ginger Ale. Although you either can't keep anything down or your constantly running to the toilet, this will help settle your stomach so you will have less trips.