@anunez- Good morning. I've also had a constant cough and lots of mucus this winter. It must have been a bit of infection because after a few days of an antibiotic (also used for pneumonia) it pretty much cleared up. But I still have mucous and a cough, but nearly as bad as before. It's scary and frustrating and uncomfortable. Have you ever been tested for COPD?
Frequent sinus infections can cause post-nasal drip, I call it "a tickle" in the back of my throat. Drainage of the mucous can trigger a chronic cough. ... It is caused by a build-up of mucus in the lungs, which the body tries to clear by coughing. Also, nasal polyps can cause a constant cough. I tend to get a constant cough more int he winter, even if I use an AC during the summer. And this year it's been especially bad. The only thing that I can say is that chronic coughs are self-propelling- once your throat is irritated it's a vicious cycle. I also found this: https://www.webmd.com/asthma/guide/cough-variant-asthma#1
Do you cough as much during the day as at night? I drink plenty of water and drink hot tea and honey every day. Have you changed your diet at all to try and calm your throat and drip?