A fever coming twice daily with cough, sore throat, phlegm, headache, and chills is often due to a severe infection affecting the airways. Take proper rest, drink warm fluids, do steam inhalation, eat light food, and stay well hydrated to support recovery. Keep your throat warm, monitor your temperature, and watch for signs like increasing weakness or breathing difficulty. Since the fever recurs with chills, consult a doctor to determine the cause and guide appropriate treatment.