4yr old.with fever and headache. no cough or mucus?

Many thoughts: A 4 year old with fever and headache can have a mild illness or a severe illness. I first think of strep throat or viral sore throat. Then i think of pneumonia, viral infection, and then the big ones, meningitis and such. I would like to know if s/he is better after some Ibuprofen or acetamenophen? Rash? Sore throat? Enlarged nodes? Eating or drinking? If in doubt, see your pcp!