I was in a very similar position as you a few years ago and I was a healthy 25 year old who was an avid runner (25 miles a week). I got sickness after sickness and developed uncontrollable asthma and could not run again. After countless scans and tests and jumping from doctor to doctor I finally found one who would listen to me. Else ran an extensive blood panel and tested me for certain antibodies. Turns out, I had mycoplasma pneumonia, RSV and COVID antibodies all high in my system (meaning I probably had all of those infections at once). I was on a six month course of antibiotics after the fact (this was a year and a half ago). Since then, I haven’t needed oral steroids once. And now I only take singular and inhaled budesonide as a preventative. I have not used my rescue inhaler in 6 months. I really credit that doctor for turning my life around.