i am experiencing left back pain, today it has moved to lower abdomen. Also dark urine. No urination pain though and the back pain is not debiliatating, but is constant. No fever, at least I dont think, I guess I wouldn't know since I have been taking ibuphrophen around the clock..... I am 29. Female. I have pulled my lower back out before, this doesn't feel the same. It's fairly dull, not spasming like before.