If you have pain radiating down your bottom into your legs....the disc is pushing on a nerve. A good dose of steroid followed up with some pain meds will do you some good. If it is a true herniation the disc has ruptured and is puking out an acidic type substance on to your nerve. Your back muscles spasm trying to relieve the issue going on with the underlying cause, the nerve. It could just be a bulging disc, either way. I would always give a big dose of steroid injection followed up with a week supply of steroid by mouth, muscle relaxers and pretty decent pain pill. Usually that will get you enough relief to make it through the worst part. Time is your friend and time is your enemy. Take it easy and chill over the next week