Thanks for writing youur query.
After reading your post, it seems that the pain you are experiencing is due to muscule pull as a result of persistent coughing. It will decrease in due course time.
Hot fomentation and application of pain relieving gel locally will give you some relief.
If the pain is severe you can take pain killer like Ibuprofen
one tablet twice a day after meals along with an antacid
You should complete the 3 day course of Z-pack you are taking. You can add antihistaminic like Fenofexadine
120 mg once a day. This will help you in getting relief from cough.
Inhaler should be started if there are signs of bronchoconstriction
, which can be judged after clinical examination and auscultation of your chest.
I hope this is helpful to you.