I commend you for your successes. I would like to ask you to watch Dr Amit Sood's TED X Talk. It has been my personal experience where I 'retrained my brain' and 'retrained my breathing'. It takes practice, but I have a feeling that you can learn how to breath with you diaphragm while you continue to go the distance with paced breathing. Dr Amit Sood has also written several books, one of my favorite is "Happiness". There is a mind body connection that you can apply to breathing. I never ran before lung cancer surgery...but now I run about 2 10k races a month...because Paced Breathing has become my guide. Keep us posted on connect, ok