Help with chronic sinus pain (which- if untreated- spreads to bodily symptoms)

I have been dealing with chronic sinus pain/pressure for the past oh i'd say 2 or 3 years. It has become more chronic as time has passed. To the point now, that I have to do a saline flush up my nose every day or every other day just so my face won't hurt. I also use a homeopathic nasal mist called Sinus Buster to help with pain/pressure. If I ignore the face pain it quickly progresses to other bodily symptoms: fatigue, extreme sleepiness, malaise, no energy, a general achy-ness all over like i'm coming down with something. I sometimes have mucous come out of my throat, but NOT excessive. Mostly the first part of the day. I can breathe good through my nose. Like I previously stated, the saline sinus flushes seem to keep these symptoms at bay for the most part. I take astragalus and elderberry to help my immune system. I take other vitamins and herbs too, but no drugs. I am wondering if tissue salts would help me. I so far have not been able to cure this issue, only offer some temporary relief. I am always trying to figure out the root cause of things. I am 7 months pregnant but this is really irrelevant to the pregnancy, as I said this has been an ongoing issue for the past 3 years or so.
Any help in this area would be greatly appreciated!