Fantasy worlds created by virtual reality have been shown to provide a novel form of relief to patients suffering from intractable pain.
The article talks about how burn victims can tolerate the painful process of their dressing being changed when they are wearing VR helmets. I have talked about this in the past using video games as the distraction. Several very immersive games helped me during the most excruciating parts of my recovery.
Battlefield 1942 saves me from at least an hour of screaming nightly. I am so engrossed in the virtual world that I don't notice the back pain.
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.