The lumbar disc issues are probably unrelated to any GI issues as Scott said. I would be interested in knowing your age and whether the MRI commented on degenerative issues or degenerative changes. Degenerative disc disease potentially can deteriorate and lead to these issues. Generally the kinds of issues you are describing are usually due to some trauma to the back (car accidents, sports, physical activity) ,degenerative issues, or some combination of both. I would recommend consulting a neurosurgeon. Various treatments include physical therapy, epidural steroid injections, pain meds and surgery, usually in that order.
I happen to have very bad cervical stenosis, which is hereditary and age related. My father has the same. A few years ago it was causing me a lot of discomfort and I went to a local physical therapist who was super. He implemented various stretching exercises and cervical traction, which completely alleviated my discomfort. The PT's conclusion was that I actually had a pinched nerve. I suspect your situation may not be as responsive to PT, but nothing ventured, nothing gained. Good luck.