Back surgery

I'm wondering if anyone else has had low back surgery for a herniated disc and still has problems? I had a partial discectomy at L4-5. Prior to surgery, I could barely walk, couldn't sit with my legs straight out in front of me and was in constant pain. Since surgery 3 years ago, I can walk fine but the other issues are still there (with severe/constant pain) and I can't get anyone in the spine department to even agree to see me. They keep referring me to PT, but I have seen 4 different PTs over the years and had no success. I feel more surgery needs to be done, but doctors don't want to risk their success rates. Can anyone provide insight if you've had similar problems?

Also, has anyone been to Johns Hopkins to see Dr. Howard Levy? I am trying to get insurance approval to see him...