Hi. I was diagnosed with COPD 10 years ago - simply because I was an ex-smoker. Last July I was told I didn't have copd but obliterative Bronchiolitis (Arthritis of the lungs) I have been getting really fast heart beat all the time and have had treatment to reduce inflammation on the lungs. Although I thought I had been getting better. I am still very very breathless and cannot even walk to the toilet without getting out of breath. I was wondering if anyone would be able to tell me if maybe the fast heartbeat is causing the breathlessness and not the lung condition. My heart beat is never less than 100 and as fast as 134. Any advice?