Girls, child aged 2 and 4 years old. Cough started about 3 months ago.…

Girls, child aged 2 and 4 years old. Cough started about 3 months ago. We treated it at home, then the doctor prescribed syrup suspension, said it was bronchitis. If you treat well, it should pass, but no, recently we took an injection of ampicillin, seemed good, but now a little bit wheezing without socks or phlegm at night again cough and smell is strong already I don't know what to do, what only not done at night it intensifies and nose runs I'm already tired, help anyone knows what else can be done ?