I realized what's happening last night--the bugs that were skulking around from my last sinus infection are trying to stage a comeback after the shot and all the antihistamines I had to take with it. (Antihistamines actually make your sinuses a better home for germs, which makes it tough if you, like me, tend to assume that congestion is the result of allergies and should be treated with them.)

I think what I'm going to do is work on the cover for the fantasy novel. I'm too run down to write (this has been wreaking havoc with my sleep schedule as well), but I feel like I should get something done....