My son is running a temp of 101.8 since wed, we took him to the doctors and they percribed an antibiotic, cough surpressant and naproxin, he was still running a temp on Friday so we took him back to the doctors who gave him a different antibiotic and a shot of antiviotic. His lungs are clear, no strep and no kidney infection, its been 4 days with a fever of 101. Motrin helps for a few hours. When the fever returns he shakes violently. He is 15 yr old healthy male . What should I do now?