I had a dry cough, severe shortness of breath and chest pain. After having a stent placed in a blocked artery the shortness of breath worsened and the dry cough
persisted. I had several CT scans done along with 3 additional cardiac catheterizations with no detection of any additional abnormality. The lung specialist I was seeing said I was a mystery patient. After about 3 months, the lung specialist did a bronchoscopy and took some lung biopsies during the procedure. Idiopathic Pulmonary Fibrosis turned out to be the culprit of the persistant symptoms. I would suggest asking your doctor about possibly seeing a lung specialist.