CHF occurred to me, too. I have a friend who has been so diagnosed and knew another who died of it who coughed for a long time. His doctor said COPD but he never got checked for that.
My friend who coughed had never smoked and had no bronchitis or lung problems. It was finally diagnosed as a heart problem. She moved away and I no longer have any contact with her so I don’t know how she is doing.
This doesn’t sound fluid enough for CHF.
I guess Post Nasal Drip because of throat clearing. . .
I forgot to mention about my coughing friend, her cholesterol was 100 and she had never taken medication to lower it. I wonder if there is any connection there.