Yesterday, I slipped on some wooden steps, my feet went out from under me and I landed with full force on the edge of one step against my lower left back, at the level of the kidney. Did not hit my spine. Today I have a large bruise and pain at the location of the impact. The pain is sharp if I twist my body, while trying to adjust my position in bed, or if I move suddenly or take a deep breath. I am using ice and bed rest and ibuprofen and/or naproxen. No blood is visible in urine. Any suggestions?