Has anyone used a tens machine regularly for chronic pain? I have bad lower and upper back pain, also radiating around buttocks hips and down right leg, due to bending forward two weeks ago and a sharp AAAARRRRHHH going right through me. Has been bad ever since and cannot take medication. Finding it hard to work, concentrate, walk, stand up or move as everything hurts. Would appreciate any input on if this is a wise investment. Likewise with the magnetic pain relief pads.