Recently started.feeling sharp, pulses of pain in lower left back above hip. i have never felt this specific pain before...what could it be?

Low back pain: Low back pain is an extremely common problem. What you are describing sounds like perhaps you "threw out" your back, which is often a problem with your sacrum. A do or osteopathic physician skilled in omt ought to be able to fix you right up. If you are having problems controlling your bowels and/or bladder, you need to get to the er right away!