After 20 +/- years of suffering from a chronic cough and seeing several doctors that could never help me, I finally got an answer. I changed from one ENT office to another one that has an allergy/asthma specialist on staff. I was allergy tested (3rd time in 30 +/- years) and am positive for 18 allergies. I began allergy shots and am now on the maintenance dose every 2 weeks (this will eventually be every 3-4 weeks). This doctor sent me to a lab for a specialized blood test and sure enough my MCH is high which classifies me as having severe asthma, but not the deadly kind. What that means, in my case, is that none of the prescription medications work for me. Some help with allergies, but not my type of asthma.
The next step is to get a biologic injection (Tezspire for me) every month until my symptoms get much better. At that point I can begin trying to wean off Symbicort. I am 73 and it has taken over 3 months to get it set up with Medicare (it was supposed to take 1-2 months). Each injection is over $3800, but fortunately they will pay every dime of it. I still have not had my first injection, but hopefully I will be scheduled soon. Stay tuned!