My sinuses have been clogged up for about a month now. Anything I take for it doesn't seem to help at all. I've tried stuff for allergies, stuff for colds, stuff you spray up your nose.... nothing helps.
Not a doc myself but here's a link to what could possibly be causing it: [Rhinitis medicamentosa.](http://www.webmd.com/allergies/features/nasal-spray-are-you-overdoing-it) Basically, your body could be getting temporary relief from sprays and OTC meds but they are actually causing your problems.
I went through this recently. I had persistent allergy symptoms and was using nasal sprays and 24 hr Claritin D every day (the stuff you have to take the tab to the pharmacy window and show your ID to buy) and it worked very well but I had to take it every single day, was using it for almost a year. Found out much later that not only was it most likely causing my congestion but also my persistent insomnia issues as well. It took about a week or so to feel better after stopping usage but for that week I was more stuffed up than ever.
Now when I get stuffed up I use a saline wash netty pot in the shower. But I am still prone to sinus infections and get them about every few months. For those I go to my doc and get antibiotics and meds to dry out my mucous membranes and it goes away after a few days.