I was diagnosed with infuenza feb 18. Since then i developed sinus infection With a cough and congestion. I was prescribed a z pac The infection seemed to clear up but i contiue to have a dull, mildly productive cough and have now developed a horrible pain under my right breast. I assumed it to be plueresy -when i cough is wen it hurts the most. But it seems to localized. I do not have trouble breathing or heaviness in my chest. Any ideas on what this is and what to do for it