My three and a half year old daughter is having nasal congestion, fever, is lethargic, complains of a stomach ache, refuses to eat, is dehydrated and is having trouble sleeping. I took her to the doctor on Monday and they checked for strep as well as diabetes. Is there anything else we should be looking for? She continues to complain that she is thirsty and her fever seems to be coming and going. She cycles between fever and chills. Could she have influenza?