Repeating niggling pain in left side lower back somewhere just above hip level. Doesn’t affect lifting too much but it manifests itself when I happen to place all weight on left leg, say I’m leaning over forward and to the left. I get the sharp pain in that area and my leg gives way, ie I have to catch myself from falling ! Very unsettling. Goes away with time but always comes back eventually, would love to know what I’m doing wrong that could be creating it.