my grandson, age 6, has had a fever for 6 days. it seems to go away during the day but reoccurs in the p.m. he has been complaining of a bad headache for several days ("my brain hurts") when the fever spikes and is sensitive to light at times. no other symptoms-no stiff neck, no swollen glands, no rash, no cold symptoms, no ear or throat inflammation, no sore joints. he has been seen by the doctor. thoughts?