I am getting waves of prickling sensations down both legs plus genitals. some times when i get the pricking in my genitals my scrotum retracts and my penis shrinks. there is a slight retrolisthesis of l5 on s1. plus disk issue is this the cause?

Your suspicion sounds reasonable: these symptoms indeed might be due to nerve compression due to your spine disease. (But not the scrotum retraction or penis "shrinking". Probably those are separate issues.) Check with the doctor managing that problem ASAP: that sort of thing can become a lot worse very fast. Don't take a risk with erectile and bladder function. Good luck.

Have yourself checked by orthopedics