I have had numb legs after a disc issue, so much so that at one point whenever I dismounted, I would collapse. It would not be painful at that time, just no feeling or power to my legs. Once I had sat there for a while feeling would come back.

The GP was not terribly helpful, just gave painkillers and said to rest.

What turned the corner was intensive physio with a physio who was experienced in reducing impingements from slipped discs. They reckoned they could avoid surgery in over 50% of cases. It worked for me. I did 2 weeks residential, happily with a scheme I was with.

I would look for a sporting focused physio rather than a general one.