My Left Leg Is Half Numb Half Not. When I

my left leg is half numb half not. When I walk, it feels like a dead leg flopping. It tightens when I stretch, and have to press hard on the floor to get it relaxed. The right leg is slightly numbing. To use a scale, i would say; the left is 5.5 and the right 1. I do have herniated disks, L4 and L5. What is the problem.