What sort of obstruction caused your problem?
I do not think that you should really have any pain with this.
If there is a fever associated with the pain then we need to exclude / treat infection.
If there is no fever then we need to exclude kidney stones.
Can you tell me about your pain in some more detail?
How often do you have the ache?
Have you any urinary symptoms - pain passing urine , passing urine more often?
That rules out infection.
If you had stones then we would expect very severe pain.
I must conclude that the symptoms you describe are not the result of your kidney problem.