My 3 year old son woke up with a fever of 103, we noticed his belly button was poked out instead of in like it normally is, we carried him downstairs and he starting having a hard time breathing as if he was all of a sudden congested and couldn't catch his breath. My husband has him at the er now, I am really concerned, he has been an hour there already, they gave him motrin and tylenol. What could be wrong with him?