I assumed allergies since that’s the usual culprit, then dehydration, then eye strain, and tried to deal with each of them in turn without success. And then while I’m feeling frustrated with my temple feeling like it’s getting squeezed in a vice, I glanced at the weather and noticed the humidity was below 30% outside. That’ll do it!

So I rigged up my electricity free humidifier (a wet towel on a drying rack), and the inside of my sinuses basically immediately calmed the fuck down. Never have I felt like I had so much in common with a pet lizard that needs its terrarium kept at specific temp/humidity/etc requirements.