My 2 year old has had a fever for the last 28 or so hours (off and on) low appetite, but drinking a lot of water. He just cried himself to sleep talking of stomach pain, but has not vomited or had diarrhea, in fact, no bowel movement at all today. His urine smelled strong today, although he drank lots of water. We have been giving him children s ibuprofen when his fever gets too high or he seems uncomfortable. Anything unusual I should worry about?