hi sir/mam relax.as you have decided to go for spine MRI,any abnormality of inter vertebral discs would easily be detected.most of the time,pain is due to paravertebral or back muscles spasm due to vertebral pathology.complete bed rest for 1 week with pain relief medication or a corticosteroid injection at vertebral facet joint are the treatment modalities for degenerative disc disease or intervertebral disc prolapse.also once check for any trivial trauma at the site of pain.if you are very much worried about your kidney status,you can go for an ultrasound scan of abdomen and pelvis to rule out any kidney cause..for the time being pain relief can be achieved by tab.tramadol with paracetamol combination twice daily.hope my answer clears your doubts.any further queries are welcome.i’m eager to attend your concerns.thank you.wish you and your family a very happy,healthy and prosperous new year.take care.bye.