Sinus stuff. I can tell you before I started using a netipot on a regular basis I would get sinus pressure that was so bad I couldn't even eat cause my teeth would hurt so bad.
Things that help, neti pot, menthol in your gum, mentholated lip stuff put a dab in your nostrils to open things up. Hot steamy showers and of course meds to get the snot moving. I'm a big fan of plain old pseudophed if you don't have blood pressure issues.