4th lumbare disc on left side extruded; three of four others are either protruding of bulging. I do not want or need surgery. Until a month or so ago, I was making excellent progress w/ pt and moderate exercise, including hill climbing and some running. Not the right lower back, buttock, and right upper leg hip joint ace. There s sciatic nerve tingling in right and left legs, usually from ankles up. What is this?