No, I don't know your cat. And far be it from me to make presumptions. I'm saying nothing about your cat, only rolling my eyes at vets. But I have spent two decades in human clinical practice solving or relieving a wide variety of complex problems, including asthma, avoiding drugs and medical fatalism. And certain patterns become clear. Asthma isn't normal animal physiology, or even human physiology. Like so many human diseases, there has been a big effort to normalise them, and true efforts to solve them are scoffed at. "You can't do that - the doctor says it's got a long name!". Well, yes you sometimes can, and I have, many times. The lady who cured her rabbit of myxomatosis with my help would agree. The vet confirmed the diagnosis, was going to destroy the pet, and she came to me as a last resort.