For Almost 4 Years I Have Had Kidney Stones Blasted

For almost 4 years I have had kidney stones blasted & removed I am now discharged from urology as stones are only 2mm ans should not be causing any pain BUT I AM in constant pain like a dragging pain always on the left hand side of my lower back no infection found but urine is often very dark and foul smelling at the moment I am on strong painkillers from go x