My wife's low back pain seems to be the lower left side of her back. This is what happens. The low back pain happens when she is lying on the bed. She says it hurts and she feels something grab as she tries to roll over or get up. This doesn’t happen as much when she is sitting. She has been to the doctor and he sent her to physical therapy. This didn’t help. She has tried heat and cold on her lower back, but this doesn’t seem to help. She has taken anti-inflammatory medication and pain pills, with no relief. Any ideas? Thanks for any help.