A week ago I slipped off the edge of an open staircase, and the exposed corners of the stairs caught my lower back on the way down.
I haven't peed blood, so I haven't seen a doctor about it, but I can say with authority that I was paralyzed with pain for a moment or two right after I landed. In that time I wasn't able to analyze the pain, only to pray for it to effing stop. The next day I felt like I'd been beaten up--I hobbled around and slept more than usual.
A week later I'm getting around normally, but I'm still too sore to like being touched right there (my 4-year-old is at just the right height to get me). It feels like the pain is deeper inside, not on the surface. If that makes any sense.