My Daughter Is 2 Years Old Weighing 13 Kgs. She

My daughter is 2 years old weighing 13 Kgs. She has frequent issue of Cough; although we are avoiding eatables causing cough. Recently she has fever, cold and heavy cough. Her fever is in control and gone. but cough issue is still existing. This is effecting her sleep and at times vomits after eating...and she is avoiding to eat now a days and keep on crying during sleep...Please suggest something...