Chronic cough

My asthma is pretty well controlled, I have been on Dupixent 300 mg Q2wks. and aerosol Advair 2 puffs at HS for 2 years. My problem is chronic cough. I have been to several ENTs and pulmonologists to no avail. This last dr put me on pulmocort 2 puffs am and pm and told me to hold the Advair. I was skeptical of this because he said my chest was clear and no wheezing heard PLUS I have osteoporosis. I followed his instructions for 30 days but my cough continued so I stopped using it and returned to Advair. My previous pulmonologist [now retired] put me on Dupixent to limit steroid use due to my having osteoporosis. He was hoping this might relieve the cough, but it did not. I have been well controlled since the Dupixent and very rarely have had to use a rescue inhaler. The ENT I see has tried everything , including nerve blocks and Gabapentin po. I could not tolerate the Gabapentin. I wake up every night about 3 am coughing my brains out. I use Mucinex anesthetic throat spray to calm it. I have NO pets in the house and I have no issues when I cut my grass. I am at a loss. Just looking to see if others experience this. GK