My 9 year old has had symptoms of headache, sore throat, coughing, diarrhea and fever. The doctor diagnosed him with croup, but this is the fourth day of fever and suddenly the canker sores in his mouth have become really big and irritated. So much so, that his lips are swollen. He also has a rash on his stomach that the doctor called pedio something and said it was unrelated. Is this something other than the croup?