Hi:it is Twokatss again: I had an endoscope too see if I had GERD but did not. I used to smoke for 7 years (18-25). I grew up in a smoking home. All this could be related. I am very sensitive to cold air., smells, like perfume,and smoke from cigarettes. I am 58 now.
I sleep most nights in a reclining chair because if I lie in bed I cough more. Not very restful.
Tell me if you have any of these factors too.