Hi, my brother is ill at the moment and i am a bit concerned, his symptoms have been vomiting, chills and sweating, he has been lethargic and has been in bed most of the day. He isn't hungry and has only been drinking water and sustagen all day, he said he is vomiting clear liquid (most likely water). He is 30, 84kg and has recently come out of hospital from a sinus operation (polyps) as he suffers from Cystic Fibrosis. Any help would be much appreciated.