Recently returned from a cruise. Went back to normal activities but except for my daughter. After 2 weeks my daughter is sick and still feeling back. Light headed/dizzy/can not eat (lost10lbs)/ no appetite/ nothing will stay down. She's a teenager that loves to eat and don't turn down any food but now after testing and blood work Doctor's still can not find anything wrong with her. Are there any suggestions that could help us out?