What can I give him to help his cough and probably the sore throat he has caused himself by coughing?

Hello, my 9 month old baby has a fever, but it's under control with the tempra! The problem is that he coughs really a lot, it coughs hollow too! He had his follow-up yesterday at the doctor for these 9 months, she listened to his lungs everything was fine and he does not have an ear infection! At the moment his cough is really intense he cries almost every time clearly he is irritated by coughing like that! He can't sleep because he wakes up coughing!