tree
I have the same problem. Been researching it for 10 out of the 20 yrs ive had it.Sorry to be so down but but it is the truth. First thing 1!! STOP SMOKING!!! That only adds to the problemget a cat scan of your lungs and a good heart check including an echo. Be sure that all the things are checked good. you may have something going on that can be fixed. So far I have yet to find my culprit!!!