I just got back from seeing The Matrix Reloaded and here is my non-spoiler review. If you liked the first one, you will like the second one. If you didn't like the first one, why the hell are you seeing the second one?
So, to sum up. If you liked the The Matrix, do yourself a favor and go see The Matrix Reloaded.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.