My Daughter Is Suffering From Cold Cough For Almost 2

My daughter is suffering from cold cough for almost 2 months.in starting doc gave her astlalin muffle d.she got some relief. But after a week again she had running nose.we changed doc se gave her benocide clavpod and surflo inhaler.she said my daughter is allergic. In between my daughter's condition got worst she got severe coughing at night couldn't sleep at nights. We again changed our doc he said she is having allergic bronchitis .he gave citragine ascoril L's omnacortil and levolin inhaler.after a week she got some relief and doc stopped the medicine giving her only azithromycin as she was having sore throat.but the very next day same problem started she couldn't sleep at night severe coughing resulting in vomiting.doc again prescribed same medicine for one more week including omnacortil .I couldn't understand why my daughter is not recovering despite such a long treatment.pls guide me