My daughter is 3 1/2 years old, and for 4 days she has had mild on/off fever, is extremely fatigued and will not eat. she is drinking fluids and urinating, but has not had a bowel movement in this time, plus a day or two. She also has been crying/wimpering constantly and is very weak. The pediatrician says the same thing they always do... keep her comfortable and call if it gets worse, but I m getting worried at this point. What does this sound like?