I had postnasal drip for years and sometimes sinus pain but no infection. I would go really slow and some of the powerful things people recommend. The doctor told me to use saline rinses like netti pot, to take allergy pills and prednisone spray. After doing this for a few weeks, my eustachian tube valves shut down and over a year later they are still shut down. You are very young to do anything extreme, I suggest getting rid of dust and old paper products, and to avoid smoke if someone in your house smokes. I stopped using so many dairy products which helped. I drink hot tea at times and also coffee with non-dairy creamer. I also got cough drops, and that seems to really help.