Yoga to cure a spine or disk problem sounds as crazy to me as cant think of anything crazier.
No way I could get into these positions even when my back was not hurting.
http://www.bikramyoga.com/BikramYoga/TwentySixPostures.php
If I tried to do that now I am sure I would get a ride in a ambulance to the hospital.
I'm telling you this stuff is like magic.
It doesn't matter if you can do the poses 100% correct. All that matters is that you try, thats how you get the benefits.
You don't have to listen to me. You can keep listening to the doctors. Take there little pills, big needles, and expensive surgeries. Good luck with that.
Whatever you do. I hope it works. Good Luck!