My baby had a high fever ,39.5 degrees, today , I go to baby hospital ,we have a blood test and doctor confirm my baby got Viral influenza,doctor give us some Antipyretic and other medicine. Then we get back, and take medicine follow up the instruction, first up fever back to 38 ,but few hours later, it back to 39.8,amlost 40. So what can i do, please kindly give a hand !