Headed to the urologist and the gastro Dr for the 2nd time tomorrow. I went to the urologist 3 weeks ago and he did a urine and blood test and stated everything seemed in line. He did not show me much attention he did not even feel where my back hurt and I was having muscle spasms at the time. Needless to say using a referred Dr tomorrow.
Have you looked at things like kidney, liver or gall bladder problems? Sounds like it could be a kidney problem, they can cause back pain.
Take Care
Also my toes tingle every once in a while.