If you can, try to take some kinda probiotic while taking the antibios. I used to go through horrible cycles of UTI's, followed by thrush from the antibios, followed UTI's from itching and putting creams down there etc!
a decent probiotic has seemingly prevented this from happening since even though I still get an annoying amount of UTI's each year! I get really slow growing bacteria for some reason so my antibiotics are always a guess at first. The labs always struggle to grow anything but then after a few days, they suddenly get a result. Even with the kidney infection, I was weeing blood and still they couldn't grow anything for 4 days! :-/
Hope it clears up soon and the antibiotics kick in quickly for the pain! In my experience, they do tend too!