Hi Sophie, I wouldn't worry about having taken the medicine. Maybe don't take any more of it, but they'll still pass out of your system, if you do have a bug. Do you have a fever? Usually they say to follow the BRAT diet when you have something like that: Bananas, Rice, Applesauce, Toast...Drink lots of liquids to keep from being dehydrated (NO SODA!-although ginger ale might help to settle your stomach), just Gatorade or Power Aide (to help with electrolyte loss from D) or water or weak tea. I hope you feel better soon!