@ericanelson02 You do have a lot going on and it must be hard to be in so much pain all the time. I do know that spinal stenosis can affect reflexes. I don't know how much MS affects this. I am a cervical spine surgery patient, and in working with my physical therapist and visits with surgeons before I had spine surgery, I did have diminished reflexes in my legs. At first, the reflexes ere hyper reactive which then progressed to a lesser response. I had spinal cord compression in the central canal in my neck as the cause. I did have fusion surgery at C5/C6 which resolved my spine issues.

With fusions, there is a risk that it can affect adjacent discs and it sounds like that is what you might be describing. Are you able to walk? These levels at he sacrum can affect a patient's ability to walk. Does your surgeon recommend another surgery now or advise you to wait? How is your diabetes being managed?

This is a link to a story you may be interested in about my spine surgeon at Mayo who treated a young person with an issue at the L5/S1 junction who was having trouble walking.
https://newsnetwork.mayoclinic.org/discussion/sharing-mayo-clinic-spinal-surgery-saves-teen-swimmers-mobility/