One of the unanswerable debates with COPD is how much of breathlessness is due to actual physical problem, and how much is due to stress, anxiety magnifying it. We all do that to some degree and it's impossible to quantify, all we know is the breathlessness we suffer. So relax, they glibly say. The next impossible question is how do you "do" relaxation!
you say you take all your medication, and I'm not doubting you at all, but I do wonder what your "professionals" have prescribed for you. I was first diagnosed with COPD in mid -90s (year not my age, I'd have been mid 40s. Gosh, unbelievable that!) AFAIR all the medication I had, or needed, was an inhaler. The only breathlessness I had was if I walked up s hill, ran upstairs, things like that. That was mild. But everyone is different, how the disease starts, location, medication suitable. You cannot take my experience as being applicable to anyone else.
But i do have serious doubts about the knowledge, competence etc of some healthcare professionals and the diagnoses they conjure up, medication they prescribe. Getting a good one is not always easy.
I'm just realising how much my gp for several years, and apparently specialist in respiratory diseases, how much she prescribed that was a quick fix but made permanent - and totally unnecessary. And were in fact making me feel ill all day. Odd how, when I phoned for an appointment a week after seeing her, I was told she had left - not only the surgery but also the country.
But I ramble, sorry.
Definitely get yourself on the Pulmonary Rehab course. It's a mix of exercise and education - govt funded with the specific aim of keeping patients better able to look after themselves and out of hospital. So they make sure it works!
And apart from anything else, the team running it have a bit of clout. If they feel you need something they cab refer you or at least make strong noises in the right direction to get you noticed by higher ups.
hope this helps.