Hi I Have A Very Productive Cough Which Seems To

Hi I have a very productive cough which seems to have caused a strain/ tear in the abdominal muscle. Very painful with a burning sensation Taft stops me coughing. Previous medical history a year ago I had a free flap breast reconstruction so area very tight. I have been prescribed antibiotics for the chest infection but am wondering the best medication for the muscle pain, so as to allow me to continue to get rid of the phlegm lying heavily on my chest? Thank you for your help.