question: My son is 15. He has had fever for 6 days. The fever has ranged from none to 104.5, with most days around 102. My doctor says it's a virus and to wait it out.  He is extremely weak. No symptoms other than weakness and loss of appetite. The doctor has done a flu test, strep test, and blood test which revealed a high blood cell count, but that's all.  Advice?