Recurrent fever cough cold. All are fyn.

My daughter is 3.5 year old. She weighs 12 kg. On July 2nd she affected with fever cough and cold .doctor did some tests all are fyn..gave clorithomycin syrup 125mg 5ml twice a day for 7days and ofloxacin 100mg 5ml twice a day for 7 days coscopin 3ml for 7 days and levotaz 3ml for seven days...fever relieved after 1week cough reduced but not completely gone...again on july 13 she affected with fever and cough cold doctor told to use the same medicine for 7 more days. Fever relieved next day cough is better but after 5 days cough is more followed by fever,cold, vomiting loose motions, after 2 days...i am not understanding why she is affecting with fever again and again she never had this before...