Do I have a kidney infection? What should I do to treat it?

after i drink something, i am not kidding, i would not kid around about something as serious, i have to pee, of course everyone does. but, the funny thing about this is that it ranges from 5 to 7 minutes from the time i drink until the time i have to pee. that is a little too fast. and my bladder and lower back( kidneys) always have terrible pain. i told my mom about this, ( i am 11, a little too young for this though) and she said to drink lots of water and it will go away. she also suggested cranberry juice. should i go to a doctors, do what my mom says, or both? i thought that if i drink lots of water and cranberry juice before and after i go to the doctors that would be a smart choice. Could someone help me? i don't want to end up on dialysis.