My son has been on antibiotics for 24 hours after a positive test for strep. However, he is still having chills and fever as high as 102.4. He has mouth ulcers, possibly from wisdom teeth, but also a stiff neck. He has had periods of feeling better, but the chills and fever are returning periodically. Is this normal with a case of severe strep? Should we see a doctor or go to the emergency room, or see if symptoms are better tomorrow?