Physical therapy will likely really help alot. I had terrible lower back pain for several years. It was not from cycling, but from stress, bad furniture at work, and a weak core. I found excellent relief from regular chiropractic visits with a chiropractor who is also a cyclist and physical therapist, and from doing Pilates with a reputable instructor.

I've been pain free for several years. I no longer go to the chiropractor, but I still do Pilates. Pilates really strengthens the core and stretches everything.

I hope you get relief soon.