Lower back pain can originate from the discs, facets, occasionally nerve roots and rarely, the sacroiliac joint. Even more rare is neuropathic pain, chronic pain mediated by small filamentous nerves that were injured by an unknown mechanism.
Most pain originating in the lower back is disc mediated. You have two degenerative discs in your back with “bulges” or herniations toward the left. I assume you have already undergone a thorough rehabilitation process. If not, this is the first step along with getting your depression treated. If you have failed rehab, you need to see an experienced spine surgeon and undergo a workup possibly including facet blocks and discograms.
More likely than not, there is a surgical solution to your pain.
Dr. Corenman
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.