HI I have an 11 year son that seems to stay dehydrated no matter how much I have him drink. He is very pale, tires very easily, has severe stomach pains which has resulted in vomiting bile. His blood tests come back unremarkable, a cat scan showed that his intestines are blocked with feces, and he has an enlarged rectum. He was taking 17mg s of miralax 4 times a day, as well as an increased water intake. drinking at least 2 quarts of water per day . he does not seem to be getting better. He has an upper GI on Monday. What questions should I ask his doctor?