Foundation Training saved my back. I hate sounding like an infomercial for them, but seriously people, it works. Simple exercises you can learn from their book or YouTube videos.
This book "Foundation: Redefine Your Core, Conquer Back Pain, and Move with Confidence" did almost magic to my problems. The exercises are dead simple and I'm still amazed how well they help.
Agreed, the infomercial nature is a bit off putting but don't let this distract you, the exercises are working