Welcome @cookieinaz, I know it has to be difficult to live with LSN and a chronic cough and not get much relief if any. I did see a small study saying that Lyrica may be helpful but it was a 2009 paper --- A new treatment option for laryngeal sensory neuropathy: https://pubmed.ncbi.nlm.nih.gov/19554633/

You mentioned years of treatment and different meds. I'm wondering if they may have been similar to this information from Mayo Clinic -- Cough Clinic employs novel pharmacologics to address unexplained or refractory chronic cough: https://www.mayoclinic.org/medical-professionals/pulmonary-medicine/news/cough-clinic-employs-novel-pharmacologics-to-address-unexplained-or-refractory-chronic-cough/mac-20510246

It sounds like you have a really good doctor who is willing to work with you. Have they offered any other suggestions for treatment to try?