My 4 year old son woke us up yesterday morning crying with a headache. Gave him some meds and he went back to sleep. Later in the day the pain came back then he developed a runny nose. Today he has runny nose, headache and a slight fever. Could it be Swine Flu? My 6 year old daughter woke us up last night with severe stomach pains?? No vomiting but severe pain, she is better today but says it still hurts.