check out Dr. Konstantin Buteyko, an early (worked in 50's.60'a)Russian physiologist/respirologist. He developed a breathing program designed to increase the oxygen saturation of cells. His followers claim they can help Parkinson's, but only in the early stages. His method has been written about in the NYT because, I think it was Duke U. that did a study that validated his program for pediatric asthmatics.
Worth a look. I have successfully 'breathed away' a couple of panic attacks, if I catch them early enough.
worth a look....SB