Jaba, I'm sure you know this, but in case you don't: a big gel ice pack is your best friend. Sit on it or lie on it for about 15-20 minutes, 4x a day. Concentrate the pad on your lower back,and don't worry about the pain down your legs. That pain is coming from the lower back and when it settles down, so will the entending pains. Ice is the best thing to bring down inflamation.
Best wishes to you.