Wow, 48 hours ago I would not have had anything to add to Jennifer's comments. You could be describing my husband - for all of the many years we have been together!
He has tried everything - sometimes in combination - and nothing completely resolved it. His was not post nasal drip or GERD either.
Last week his pain management doc, of all people, recommended Azelastine nasal spray. We just learned it is available over the counter in the same strength as the prescription version. Just a few days, and his throat clearing has almost disappeared! And he has been able to stop 2 of his 3 allergy meds.

Sue