Has anyone ever had a kidney infection?

if so, what were your symptoms? were they all of a sudden or did they come on gradually? how was it treated? what did you do for the pain? i think i might have a kidney infection, but i am reluctant to go see a dr. if it is just a pulled muscle in my back. i don't really have any other symptoms other than... show more if so, what were your symptoms? were they all of a sudden or did they come on gradually? how was it treated? what did you do for the pain? i think i might have a kidney infection, but i am reluctant to go see a dr. if it is just a pulled muscle in my back. i don't really have any other symptoms other than nausea, and pain in my left side, kinda towards the back in the rib area. i think that dr. or medical people call it "flank" pain. my husband says that i should go to the E.R.. but that costs alot of money. advice plz!!
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