@nanashelly You have certainly been through a lot and when pain becomes electric shocks that can get bad. With all your surgeries there will be fascial scar tissue that might be a contributing factor. Myofascial release with a physical therapist can help if it is an adhesion from scar tissue. There are also some nerve entrapments that can happen in the pelvis due to alignment that would cause sciatica pain type symptoms. The time that I had electric shock type pain, it was from the pressure of fluid from an epidural injection that had no place to go that put pressure on a nerve root in my neck. Have you contacted your surgeon about the pain? I do know there can be hardware failures and screws can pull out. The lower end of the spine is bearing all the body weight that adds more forces onto the hardware. I think you should get some imaging to see if anything has changed since your last surgery. My spine surgery was in my neck, so I don't have the same area affected, but I have watched a lot of online presentations at spine surgery conferences that talked about pedicle screw placement with hardware and what they call global spinal balance which has to to with the angles of the pelvis in relation to the spine and where your center of gravity is. With a flat back syndrome, the center of gravity is not in the right place. The angles, depth, and placement of crews is critical in how well they secure the hardware, and can cause failure if not done correctly. Because of deformity, sometimes surgeons are removing part of the bone to correct the angles in relationship to the other vertebrae before they fuse the spine in that position. You may also want another opinion from a spine deformity specialist. My surgeon (in the video about scoliosis) would be a specialist with expertise in this area. I would ask for an explanation with imaging as to what might be the source of your pains and if that pain is spine related or not. Here are some links with information.
https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/
https://trainingandrehabilitation.com/identify-treat-lumbar-plexus-compression-syndrome-lpcs/
https://trainingandrehabilitation.com/true-solution-lower-back-pain/