My Son Is 1yr 2 Months Old, He Had Cough

my son is 1yr 2 months old, he had cough cold at diwali time but he's better now , but the problem is that since 4-5days he is not eating well neither drinking milk that he normally used to n vomits 2-3 times when I feed him forcefully, hw can emeset be given or any other medicine you suggest