I m a 72 year old woman who is in reasonably good health, Except for the last few months I have been experiencing difficulty in breathing. I cannot walk short distances without getting out of breath. Longer distances make me completely out of breath and unable to speak, Several months ago my doctor sent me to a pulmonary specialist and the results were unremarkable as he put it. However I think the results were somewhat tainted. The technician tried one breathing exercise 6 times, Because he could not get any results, he stopped. I asked him to give me his best guess as to what my problem might be he said it might be a blockage in my lungs. Nothing further was done or said,