Since yesterday morning my father got cold he used over counter Cetirizine 10 mg in the evening 7:00pm. At night 10:00 pm he started feeling chills from 11:30pm  he got fever . He took dolo 650 today morning 10:00 AM the fever is 101°F persistent from morning. After 2:30 pm the fever comes down to 99 °F and Again from today evening 7:00 again fever started increasing they other symptoms body pains , head ache, burning sensation of eyes, sore throat, throat pain, nasal congestion, occasionally dry cough, lower back pain . please send or tell treatment and remedies and please diagnose him.