I have been experiencing this for almost a yr. It seems to get better then comes back. I have had all kinds of test. they said I have a Bulging Disk. I took an MRI. I have taken Vaginal Sonograms, Regular sonograms. I though it was my Ovaries but they see nothing. As a matter of fact they can't find my right ovary because my Gyno said it shrunk being that I do not get my period anymore. Sometimes I wonder. But today I woke up and my lower back is killing me. The pain seems to radiate to my hips and abdominal area. I wish I knew. The only thing my doc said was he can go in Larascopic to make sure nothing is wrong. All tests are coming back negative!