i had an ultrasound done on my left kidney in june because of severe pain in my left side. they said there were no stones, and treated me for a kidney infection. now 4 months later my doctor is telling me that i should have seen a urologist because when they did the ultrasound my kidney was enlarged and had fluid on it... or in it? i'm not sure. they did not tell me this at the time. i dont have insurance, but i do plan on going because my doctor seemed concerned. anyway, what could this mean? should i be worried?