Time to call my doctor's office again (not Dr. Ciccinelli directly, unfortunately; he's out of town in Arizona). I've been noticing oddities about my toe last night and this morning, and developed some concern that I have an abscess in my toe. I just confirmed this supposition by lancing the suspect spot with a needle and getting about half a teaspoon of dark, bloody pus out of it.
UPDATE:
I just got off the phone with Anne, the nurse at at East Carolina Foot & Ankle. I now have an appointment at 0930 tomorrow (with Dr. Roman, as Dr. Ciccinelli is -- as noted above -- out of town). I've done what I can for now, basically consisting of topical antibiotic and a gauze dressing. The implication, of course, is that whatever's in my toe is resistant to the azithromycin they already gave me.