My mother age 49 has been suffering from fever for last 8 days. Her fever is between 99-101. If she takes paracetamol 650 mg then after 3-4 hours fever goes down then after 4-5 hours again come. She has taken azithromycin 500 , 6 tablets for 6 days and 1 gm ceftriaxone injection 2 times in a day for 3 days but still she has headache and no appetite at all and underarm temperature below 98 but in mouth 99.5 - 100. CBC test normal. Widal and malaria test normal. Now what is the treatment left ???