Kidney infections, by and large are no big deal, settling within a matter of a week with antibiotics.
If the infection recurs or is resistant to treatment, then investigations have to be performed to exclude an underlying cause.e.g abnormalities of the kidney, or stones.
There a many types of kidney stones, some remain silent, some migrate into the ureter (tube between kidney and bladder) causing pain (renal colic) and some pass into the bladder, causing pain and bleeding and some pass out with minimal pain.
I just have the feeling that your attack will settle within a week without further complications.