firstly, if your lower back pain is due to discs, it can never be healed completely. care should be taken that it does not become worse which may cause complications.

I figure your MRI scan shows disc issues? if yes, your first course of action will be physiotherapy sessions. this will significantly decrease or stop the pain radiating to your leg and the need for injection will not arise. besides, injections and surgery are the very last measures to be taken.

I have 3 degenerated discs which radiate pain down my right leg (well, not exactly pain... more like discomfort). I have had physiotherapy sessions and now the discomfort appears sometimes but is not a daily occurrence. feel a lot better now.

hope this helps.. cheers!!