re: lower left back pain -- any suggestions on quick relief

Is it muscular? A TENS machine, a massage by a real masseuse who knows what he or she is doing, stretching the legs and abdominal wall, NSAIDs and muscle relaxers, and ice (if it's been less than 24 hours) will help.

If it feels like it's spinal or the result of some trauma, go get medical help. You may have a slipped disc or pinched nerve. They can't do shite for muscles except prescribe an anti-inflammatory/muscle relaxer. Maybe get you in to see a chiropractor or professional masseuse.