Do you have Gerd?
It could do like it does for me: flares up, spills over and affect your lungs.
If you have "silent GERD" you always feel like gunk is in your throat.
You cough up sticky phlem and you have no wheeze in your lungs. Asthma meds seldom seem to help.
Sometimes in the mornings your mouth tastes just plain nasty!
You tongue has a coating on it that doesn't seem to go away even with brushing.
Think about it.