Shortness of breath has always been one of my worst and most persistant symptoms. Early on, I felt like my breathing was partially paralyzed, and spirometry reflected that. I feels now (months later), like I am breathing through a straw most of the time, and that something is restricting my lungs to keep me from getting a full breath. Pulmonary/exercise tests show some abnormalities, but it's not "too bad". What is interesting, is that if I get VERY COLD and stay cold (like my nails are blue), I can breath so much better!!!! So, I do believe it is something vascular, they just don't know what. It is very reassuring, though, to have it better, even if it is an isolated time. It shows me that everything has the potential to work. BTW, I have much more trouble breathing while lying on my left side, next worst is my right side, easiest is my back. You may want to check out if any position helps you. It seems paradoxical, but after I exercise (recumbant bike), I feel a little more on top of the breathing, too. So, even on kinda yuck days, I at least TRY to exercise a little. Hang in there. You are not alone in this. My doc at Mayo said that he's had a couple of patients who needed to be taught how to breath again!