wishing you peace. Soon! I was once (mis)diagnosed with COPD
and spent a month or so fighting to breathe and believing that I'd be chained to oxygen and who knows what else, so I know something of what you are going through and I empathise. Breath is truly life.
edit:
please note that at first the method sounds entirely counter-intuitive, but the more you look into it, and condsider it, the more sense it makes. It's a bit of a revelation, really. And has helped thousands get off all medications, CPAP machines....