Chronic cough following sinus infection
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i've am dealing with something exactly the same. The mucus in my case is coming from my sinus or somewhere above the palate in the back of the nose. I suspect there is an allergic thing here as antihistamines seem to help.
I used to worry that the mucous was coughed up from my lungs too - it's a scary thought that there's something wrong woth your lungs. But when i relised it was just originateing from above and gravity was taking it down, then I could relax known that the lungs were not the source of the problem. I also learned to get rid of the mucous early - ie suck it down and spit it out before it goes into the throat - this means I don't actually cough much any more. I still do in the morning as some has gone down while I was asleep. I had been through xrays and all sorts to try to find the source of my chest pain - it was from all the coughing.
doxycycline fixed the sinus infection and i had pseudoephedrine to dry everything up. Am now attacking the allergy component with antihistamines, etc. I find it's worse when we have the washing machine on - must be something in the detergent that gets me going.
good luck