I just tried going off the Gabapentin and Amitriptyline to see what would happen. My cough definitely got worse so apparently they are working. I did see an allergist and took allergy shots for 2 years but that didn't help at all. I'm seeing a new ENT now because I have developed severe mucous in my throat which increases my coughing. He recommended a sinus rinse which I hate using but it definitely helps so will continue with that. I'm waiting for a miracle cure. LOL..