Over the years I had been to 4 different physiotherapists, tried everything from regular core exercises formulated by Stuart McGill, to Infrared heat bands, climbing alot. It would always come back.
I picked up Sarno's book about 6 months ago and I approached it with a highly skeptical eye. My back pain is nearly completely gone. I have had very minor flare ups that last a day or two, but I just repeat a few mantras and it disappears the next day (whereas before the same kind of flare up would last for months).
I even had MRIs done at the start of the pain, I had multiple bulging disks and even a spine that appeared too straight. For anyone reading, don't let this discourage you. 50% of people who have had bulging disks appear in an MRI don't experience any pain at all!
Sarno's book has some pretty flaky theories behind how the pain manifests and the physiology of it all, but the overaching theme is that repressed anger / anxiety can manifest as severe back pain. Once you recognise this you can lose the pain. I never thought I would fix my back pain, but now I have.
Read the book if you're suffering!