HI and welcome, your question has landed in the MS community and whilst people with MS can also have disc issues it's not a primary MS issue.
Depending on if the bulging discs are impinging nerve function, it would be possible for your structural spinal damage to be causing the twitching and bilateral numbness in your legs but you really need to see your specialist to determine if there is permanent nerve damage or if there is something that can be done to improve/resolve this situation, so id advice that you contact your doctor.
Hope that helps.........JJ