Oh! to be in Paris between 1917 and 1924, especially if you were a genius or an independently wealthy American. Why Paris - what made people want to come here and create? Cheap wine? Nice cheese? A nostalgia for the birthplace of modern revolution?
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.