After I'd purchased my bill of goods and given the store my contact info in case I tried to sue them, I put on the ankle brace and some Tiger Balm, and ate lunch at Chi-Dog three or four blocks away. I feel lucky in retrospect that I decided to go to Walgreens and Chi-Dog rather than straight up to Oakland like I had planned; passing out on I-880 would have been amazingly bad.
So instead of cleaning up the apartment, instead of going to Oakland, instead of going to any of the four raves or so this evening, I took a very hot bath, chatted with some people online, and am now finishing reading Iain Banks's "Use of Weapons".
On the whole, I'd have much rather gone out and had fun than lain at home. Oh well, there's always next time (bah!) I just hope that I can get a doctor's appointment real soon.