I finally had a CAT scan and it shows that my lungs are fine, except from some harmless scarring from prolonged coughing. Antibiotics have no effect on the cough. I've used Tussionex
(codeine cough syrup) for years, but drs. don't like to prescribe it, so I use it when I can't stand it any more to make it last. The cough leaves me so exhausted, and my muscles painful, and it's almost impossible to sleep. It almost always starts the second I lie down as I have a post nasal drip.