As someone who works in an extremely small, but highly lucrative, niche market, I was very intruiged by this analysis of the pitfalls of parity. The pressure to do everything because your competitor does it is present in every business, but seems to be higher in these small spaces.
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.