I had a bulging lumbar disc - pure agony for 18 months. I had become used to carrying a lumbar pillow around with me everywhere I went. I couldn't lean forward for more than about 30 seconds without it being unbearable.
Then someone suggested I try dead hangs, stretching my hamstrings, and really cranking the McKenzie stretch. I'm not sure which one made the difference (all 3?), but pain was gone in 2 weeks.
Maybe it will help, maybe it won't. But since someone took a flyer telling me, I always share this with others in the small chance it helps them.
Do you have any links for how you did these stretches? I know someone that could do with trying this.
McKenzie stretched helped me rehab a pulled muscle in my lower back (originally thought it was a disc).
Deadlifts also helped strengthen lower back muscles. Tight hamstrings from sitting on the computer all the time also didn't help. I'll try dead hangs.