Had epidural injection for herniated discs l4/l5...was told to start walking. my toes are going numb & having spasms in my buttocks. why is this?

It is may be unrelat: Esi's usually do not produce this problem but may not have reversed all your symptoms caused by the herniated disc. You should be examined by a spine specialist either an orthopedic or neurological surgeon to determine the cause of your problem.

Epidural: Epidural injections relieve pain and inflammation through the combination of the local anesthetic and a corticosteroid introduced at the location where the damage is. Sometimes the herniated disk is compressing the nerve, so you need emergent the consult with a neurosurgeon. He will be the one to decide what the next step is before the damage is bigger or permanent.

Hard to say: Depends on where and what the injection was. Could be a radicular pain. If you have fevers or lose control of bowel or bladder or lose strength go to emergency room as it could be a bleed or infection.