When I had breathing problems and severe shortness of breath in the past it was always related to stress and anxieties in my life.. and realizing I had a "breathing problem" made it even worst, because now I was thinking I have a problem with my health on top of whatever was going on... slowing down, relaxing, finding my way our of the anxiety and stress eliminated my breathing problems completely... I hope you'll find your way out soon too.. also emofree.com offers a technique called EFT - emotional freedom technique - I'd try tapping on your breathing problem and whatever aspects that brings to mind, like the frustration that the doctors can't find the cause, or the stress it brings you... I also found this: "Conscious Breathing" by Gay Hendricks, PhD. This book was highly endorsed by Dr. Andrew Weil who described it as "the best book on breathing out there. Maybe it will have suggestions that will help you - good luck -Maya