Suggest Remedy For Dry Hacking Cough

After colds I get a dry hacking cough that lasts for months, have been to many drs, including pulmonary drs, no one has been able to help. I've had it when I was in the Navy at proper wgt and now overwgt, it happens every year usually in the fall but often starts in the summer as i have it now, It continues until I give a loud cough sounding like I'm going to vomit. My back and lungs burn badly when this happens.