I have had back pain for eight years now and it radiates down my spine. I went to the doctor and had an MRI and they said I look fine. The back pain never went away. Today I woke up with extreme middle pack pain, I cannot twist or turn around or lean over, and when I am walking I get instances of sharp pain in my leg. I cannot lift heavy things and cannot lay, sit, or stand comfortably. Medication does not help, what is this?