My GP diagnosed this about 2 years ago, and I hadn't had it before that. Now it's still there, constant, and such a nuisance (and embarrassing). Coughing frequently, throat clearing etc (worse in the mornings). Obviously right now it's not cool to cough 
I've tried eliminating dairy, I don't want to eliminate the dog. But I'd love to know the cause. Does anyone else have this? If so, do you know the cause and have you been successful in getting rid of it?