Well you are experiencing upper back pain
and blood in urine as evident by RBC(what we call microscopic hematuria
).I think we need to exclude any kidney stones first,besides any kidney pathology, for which you need to do a ultrasound
KUB(kidney ureter bladder).You can also go X-ray KUB,which may put some light on the pathology.
You need not worry much and you can consult a urologist
after doing these two tests.
Good luck. bye