I'll be praying for you. COPD is scary sounding but by treating it and knowing your "breathing" difficulty triggers, you are doing a lot for your self.
I have COPD and asthma. I have to really know what causes problems. And it sounds like you are well into your treatment plan and prevention plan.
IFound a new one lately and it's wood burnings.....oops we heat by a wood heater...may have to change that next year.
Please take good care of yourself and also try not to worry about this too much (easier said than done sometimes.) I've actually tried Yoga to relax sometimes but I really don't like those funny looks I get from the kid critters when I practice outdoors. I have one chicken that just keeps looking at me funny when I did Yoga. It was like gawk gawk and then look away and back and shook her head and bawk bawk again. SO now, Yoga in the privacy of our house....Smile..Take care.