Tramadol
"I have taken Tramadol of and on for 4 years.  I stopped taking it due to kidney pain on right side.  The Doctor insisted I take it for a back injury, told it him it gives me kidney pain and dismissed it.  Forward 6 months later when I took tram I would eat greek yogurt and kidney pain would go away, then one time had no yogurt took tram and pain stayed, increased and traveled to other side.  I went to Dr who  did urine test for infection which was inconclusive, 3 rounds antibiotics, an ultra sound, 2 CT scans, still no answers.  The pain has decreased by half as long as I don't stand long or do to much activity. Feels similar to menstrual cramps but only higher up and right where kidneys are at and like someone squeezing my kidneys, also sometime would feel like kidneys swelling up."