injured low back 2005 quickly lifted 35pound child swing over my right sholder felt pop. have lifted, pulled, pushed, very heavy pt's. when I worked. pain has got worse running down my left leg back and inside of leg foot tingles and numb heal also hurts to step on. 2 wks go turned bent over pain shot down right back of my leg, legs now weak and tingling saw md today. what do u think is going on with my back?