So, the sinus infection has been clearing up--I didn't take any medication last night or today, which made me very happy because medication always makes me groggy and tired.
Except that I was EVEN MORE groggy and tired today than yesterday!
You can imagine the length of time it took me in my present mental state to sort this out, but: This all started right after I got a flu shot. So I am actually in Flu-Like Symptoms Land, which is a part of the larger Kingdom of Your Immune System Is Trying To Kill You. Hopefully it won't last as long as the flu. It's certainly not as severe as the flu, but of course that's not saying much, since "more severe than the flu" for me would mean, "The person who found me dialed 911, and I went straight into the ICU."