I have almost the same issue because of my sciatica. Walking kills me. I don’t usually go to large stores because of it but when I do, going in I’m almost fine but by the time I come out my left leg is almost dragging and the pain is awful.
I have spinal stenosis. I can walk however the pain at times is unbearable. My legs go numb and I fall over. When I get out of my car, I look good. After a half trip through the grocery store, I have to pause and sit down. I would give up my placard in a minute to walk normal again.