I have major right leg, foot, knee & shin cramps along with numbness. Had L5 S1 disk surgery. What can I do?

L5 S1 HNP surgery back in 04, my neurologist has no suggestions. What can I do I’m in pain and often can not walk. My right back leg is numb from buttocks to toes. Can someone please provide me with any additional information? I have been enduring this pain for 4 yrs & need a change.