Grade: 3
I think I have to accept that my rib injury is worse than I was hoping. My strong suspicion now is that I do have a broken rib. No point, though, in getting it x-rayed to confirm or refute -- there's no real treatment for a broken rib other than just to wait for it to heal, which is what I'll have to do regardless.
Caused by tripping over a ruined wire fence in Webster Park! Probably 90% recovered as of this writing, on May 11, about 3 weeks after injury. Really, not too bad.