Lower back pain on and off for a year. suddenly worse day with no known mechanism of injury. cannot sit, stand, or walk without bad pain. muscle relaxers not helping. pain sometimes goes down front of left leg. now having blurry vision. advice?

You need a through evaluation with MRI of back -may be sciatica, and blood work and other imaging to insure that not a mass or autoimmune process. . Go to ER today especially since there is new onset blurred vision.

You may possess lumbosacral spondylosis with degenerative disc disease, or a lumbosacral stenosis. The acute change could be secondary to discogenic damage. An MRI will answer some of these concerns. A visit to a physiatrist might help rehabilitation efforts. Physical therapy is often very helpful.