Hi Lee,
I too have this awful complaint. I developed sinus issues after a bad cold approximately 18 months ago. I was put on about 6 courses of anti biotics last year which really lowered my immune system. I've also tried all the sprays that have been suggested but have now thrown them all away except for saline spray as it is safe to use to clear out some of the muck at least when it is bad.
I saw an ENT in early May last year. He suggested also throwing away the sprays. I also threw away the nasal irrigations as well, those got into my eustachian tubes in my ears, causing further misery.
I've had blood test for allergies and they came back clear for dust, pet dander, mould etc. I started seeing a Naturopath about late June last year and whilst I am not cured (far from it) he seems to help me a lot.
The first thing you need to do is get a tri pillow and put it underneath your regular pillow so it hoists your head up a bit, allowing mucus to drain better. Don't put the tri pillow on top, you will wake with a sore neck.
Drink HEAPS of water. I am talking 2-3 litres a day. (A litre of that could be hot teas and coffees so don't despair but you got drink heaps of the clear stuff too.
See a naturopath for acupuncture once a week until your symptoms lessen and then see if you can go longer ie a week and a bit, 12 days, 14 days etc. I currently see mine once a fortnight sometimes more often in winter when the symptoms seem worse. Ensure you get the right combo of Chinese herbs for sinus inflammation. Mine are called Xin ya San and look like tiny black marbles. He also gives me other stuff when I'm having a bad time with inflammation and congestion. Again, winter seems worse than the summer.
I also take evening primrose tabs, 2000 mg a day and garlic, horseradish and vitamin C capsules super strength 2 x twice a day. If your diet is lacking, look into something called Juice Plus capsules. Expensive, yes, but they seem to have boosted my immune system, making me a bit stronger to fight this.
I seem to have a non allergic rhinitis, no cure they say. It may be that it may be better after menopause has been and gone (who knows, they do say that women heading into menopause are often prone to sinus issues). Non allergic rhinitis has all the symptoms of allergies and although there isn't a cure, treat the symptoms as they occur. I seem to always have vicks vapodrops on me or vicks or sinus balm to put under my nose when I am bad.
Steamy showers are a mainstay. Steaming over a bowl of boiling water and eucalyptus sometimes helps if I am super stuffy - again not a cure but provides some relief.
Try not to allow yourself to stress or become over anxious - seems to make things worse. Easier said than done sometimes, I know only too well.
I've also gone off most dairy in the last 4 months, takes a while to kick in and I sometimes have a sprinkling of parmesan on pasta or a scrape of butter on toast instead of nuttelex when I feel deprived but if you can stay off it, it sometimes helps to slow down the nasty post nasal drip.
Hope some of this might make sense and help a little. It's only what I do and not from any medical journal or "How to get Better" book.
Take Care, Margy.