I, like you, have the same problem. This is what I think is the cause, in my case, after trying to understand just what has been happening over the last eight months.
Prior to the "pain" starting I had complained to my doctor that my right knee had become swollen and was "clicking". This, he said, was osteo arthritius.
Over a period of time I was aware that the clicking had stopped and that the pain had gone. It was after this that the pain in my back started.
I have now reached the conclusion that as a result of changing my posture, particularly when walking; I walk aproximately 20 miles per week, has whilst, relieving the knee pain, caused pressure to be exerted between my rigth hand rib cage amd the pelvic bone.
I am now taking care to reduce the load I am putting on my right side and trusting that this will bring postitive results.
All this might be an indication in respect to your difficulties.
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