Cold and Cough

Patient : I've been coughing since Friday and my chest hurts and it's difficult to breathe a little. I went to the doctor yesterday and he checked my chest and said it was just a cold. I do have post nasal drip and my head is hurting. He told me to start Mucinex DM. I did yesterday all day and it helped with the coughing but I took it today and I am still coughing and my chest is hurting. He gave me Z pack to hold onto if I am not better by Wednesday. How long does Mucinex take to work? Should it already be working by now? And if I take the Z pack will it help?
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