I know you're still young but have you had any type of imaging done to check for possible congenital abnormalities? Admittedly, I'm an old guy, but I've been fighting lower back pain for a long time. 15 years ago I had a CT scan that revealed mild bulging discs which the doc said were caused by weak lower back muscles and mild mis-alignment of the spine. I've gone through osteopathic treatments, chiropractic treatments, physical therapy and stretching, spinal decompression, AIRROSTI (google that one) and continued with my daily exercises during that time. The last year has been very painful. A month ago I finally went and got an MRI and the radiologist's report was almost two pages long listing congenital abnormalities, bulging discs, arthritis, mild scoliosis, and "severe left neural foraminal stenosis at L5/S1 with encroachment of the exiting left L5 nerve root". The first surgeon I was referred to said much of this I was born with and it has finally caught up with me and he is recommending surgery. I'm now scheduled for a second opinion appointment with a nerosurgeon to weigh my options. Not trying to scare you, but just give you an example of a possible problem area. Best of luck.