My back went out about 4 days ago. And I can't lift my legs up but maybe only a inch off the floor without it hurting my back and have to walk slowly?

Strain. This is most likely an acute lumbosacral strain with muscle spasm. Apply cold for 48 hours and then switch to intermittent, moist applications, liniments like bengay,and,if you can take them,nsaids like Advil or Aleve (naproxen). Your physician can prescribe a muscle relaxant like flexeril and/ or a lumbar brace if necessary. Such cases, if severe, take 7-10 days to resolve.