I have been to the doctor initially for what I thought was the flu. Turns out I have allergies (new to Texas), then it turned into a sinus infection, then strep throat. Have taken Z Pack and just finished amoxicillin. Doc also have me Zyrtec, Flonase and another prescription med for allergies. Now I have this nasty cough that hurts and won t go away. Ive taken xrays and no pneumonia, no bronchitis in the chest; all clear. What could this cough be?