Why am I so congested? What will make it go away?

The last couple weeks I’ve been so congested. It’s like my sinuses are so clogged I can’t breathe through my nose at all at least half the time. Blowing my nose doesn’t really help much. I’ve tried nasal sprays, both regular saline and one with phenylephrine (a decongestant). Neither works for more than a couple minutes. I have dust allergies and it’s been pretty dusty, but it’s bothering me a lot lately. My allergies haven’t bothered me much in years before this. My sinuses are so clogged that I can’t even swallow without pressure building in my ears. It’s so uncomfortable. I keep waking up at night completely parched, because I can’t breathe through my nose. I tried one of those breathe right nose strips last night and it only helped a tiny bit. I don’t know what else to do. I’m so uncomfortable. I haven’t tried allergy pills (like Zyrtec), but they never helped me at all when I had allergies a few years ago. I just need some relief from this feeling of a giant ballon being blown up behind my eyeballs. I can’t spend all day in the shower so I need a better solution.