Back in mid Feb I pulled my lower back. Its happened before. Shortly after that, I develop sciatica on my right side. Feels like a coat hanger going from my lower back to my toes. I wouldnt wish that pain on my worse enemy seriously.
What works best for me is rest rest rest , exercises and not doing to much. Its been a good six months and im finally getting over it.
Regardless of what back injury you have its best to stay off the bike until you heel.