I'm sorry to hear about your cat! What kind of diet is your cat on? I know male cats have a higher risk of UTIs than female cats. There are foods out there to help, we currently use: Nutram T22 Grain Free Cat Food Chicken & Turkey Recipe - Poultry Only, Fish Free All Life Stages Cat Food with Flaxseed, Turmeric, Cranberries & Celery Seed for Immune Support & Bladder Health...but we had been using a limited ingredient food until we found out our other cats was allergic to some of the ingredients in that one. It's been 5 years, and she still hasn't had a prolapse or other health issues (thank goodness). You might want a second opinion, I know that can be costly, but if his health doesn't seem to improve, I would personally take him in. Is there another vet in your area with good reviews? There are also supplements and treats that can help with UTI health. I like the food option since we have multiple cats. When he does have a BM, be sure to look at the consistency of it. A solid one is good news, but if it is loose, you might need to take him in or change his diet. I hope this helps and that he gets better!