Can The Kidney Fix Its Self How Does Bladder Infection Turn Into Kidney Infection?

How does bladder infection turn into kidney infection? - can the kidney fix its self

I was diagnosed with a bladder infection and am taking antibiotics, but the last two days my back was in great pain, and I am sure that my kidneys. Can I permanently resolve my medication for my kidneys and bladder? or do I have to the doctor again and get a different medicine to fix my back? "