Although tonsillitis can present with fever, sore throat and ear infection, clinical examination is required to confirm the diagnosis. The infection could be bacterial (Strep throat) or viral (as in mono or infectious mononucleosus). Since the fever is lasting for more than 10 days, I insist talking to your doctor about getting a Widal test done to rule out typhoid as a possible cause. Paracetamol has to be given to bring down the temperature. Steam inhalation should provide relief.