My rat just turned a year about a month ago and had a bladder infection that I treated for 2 weeks and seemed to go away, but now about 2 weeks later on a strictly rat food diet she is urinating blood again. Is there any natural remedy I can use to help cure this without spending another 110 dollars at the vet? Or perhaps a good antibiotic i can purchase online? At most she seems lethargic but still eating and drinking normally. Thank you if you can help me.