When I get a sinus infection, it sounds a lot like what you have. They almost always come on really quickly. I can usually tell the difference from a cold in terms of the degree of my symptoms. Plus, I sometimes (but not always) run a fever. I've had some SERIOUS nasal congestion and a sinus headache the last few days. Nothing but mentholatum (think Vick's Vapo-rub) has helped, including decongestants and my netipot. I keep excepting this to turn into a full blown sinus infections, but so far it hasn't.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher