I am pretty sure that it is normal to have pain where you once had a stone. Did you pass a whole stone or did you have surgery?
I had an 8mm stone try to pass in june..After having lipotripsy to break it up, I passed what I thought was all of the stone. Until a month later, I had horrible pain in the same side and blood in my urine. A day later I passed a tiny piece of the original stone that had been pushed back up into my kidney during the lipotripsy. Becuase my stone was so large I still get "phantom" pains in the area the stone was... I had my doctor do a mri just to make sure there were no other stones or pieces of stones causing the pain. That's when he told me it is normal to have "phantom" pain and that it could last several months. My mri confirmed that, atleast in my left kidney, I do not have a stone. (it is show a large stone in my right kidney though -- lucky me :0)
if you had surgery, I would check with your doctor to make sure you don't have any straggling pieces hanging around..If you passed the stone on your own, you may have scar tissue or other damage causing you the pain..Or it could just be phantom pain. I'd check with your doc!