My 4 year old child, suddenly, last night developed awful stomach pain and a really high fever and complained of his throat hurting. Today the fever was gone, stomach pain was very mild, and no complaint of sore throat. Suddenly he developed a102 fever. Now his throat is hurting and he is very sleepy. He was just fine. What could be wrong and do I need to take him to the ER or just schedule a Dr appointment? Thank you, Jessica