While I can't relate to having constant backpain, I do understand how debilitating it can be!
I get what I call back-migraines on occasion.
A couple of years ago I discovered it was because of my gallbladder and gallstones lodging themselves where they shouldn't be, but, once or twice a month for years I'd get this back-migraine. Doubled over in pain, can't walk, can't sleep, can't shower, ibuprofen doesn't work, panadol doesn't either, crawling into my bed feeling as though I'm dying, fetal position, finally manage to cry myself into a 20minute sleep. And then I wake up. Bright and pain free (because the stone stopped blocking the tube), but, it will happen again and I loathe every day as I wait for it to hit again.
Sorry, I'm rambling. I just wanted to say that I feel for your backpain!! <3 <3 <3