Lower Back Pain

While I still don't know if my lower back back is totally caused by old age and not a little by cancer treatments yet, a curious thing happened to me last night and this morning.  I have had a consistent pain across my lower back for the last several weeks.  It first started on the left side and my first thoughts was that I might have a kidney infection... then it moved to the middle of my lower back and I assumed it was caused by my bending over a saw horse several days cutting wood for my deck; then, it moved to my right side and I again thought I had a kidney infection, then it moved down into my right hip and the pain was so bad that they only way I cut reduce the pain enough so I could sleep last night was to lay on my right side, exactly on top of that part of the body from which the pain was emanating....   and that's the curiously odd part...  usually one would lay on the opposite side from which the pain had originated, not exactly where the pain was originating but that seemed to work for me.