I have had the flu for 20 days in a row now. It started out as puking/constant cramping, and the runs. Now it's just the runs, a fever, and a wicked headache/body pain. Lost 15 pounds (and I was skinny already).

Drink Pedialyte (not gatorade because it is high in sugar). Do the BRAT diet- bananas, rice, apllesauce, toast.

Good luck, hope you fare better than I have.

edited to add: I've been to the doctor twice and they can't do anything because it's viral. Next stop: hospital if this doesn't let up.