Hello, my boyfriend's cat is 9 years old and he got her a year ago, she's a very fat cat (18 pounds), and she has been on a diet since he got her since she was so large, about 3 days ago she started spotting blood in her pee, we took her to the vet immediately and they said she had a UTI, started her on some medication and we've been giving it to her, however the blood is clearly getting heavier and she's wetting the bed all the time, she's had troubles with peeing in the litter box since he got her so she usually goes on puppy pads but now she cant even seem to get to them. We're very concerned for her and would like some advice!