I have been coughing, hours at a time, since February 2015 (yes -- 2015). The cough is very productive, including blood. The chest x-ray indicates that there is no problem. Last night I coughed for 3 1/2 hours. I ve seen 2 ENTs, 2 Rheumatologists, 1 GP, and even an Oral surgeon. Any ideas? This is NOT a hoax. I m exhausted.