Urgent Help for Noah's Veterinary Expenses

Monday morning, I went in to feed all the kitties, and our boy Noah was missing, which is really unlike him. He’s normally the most vocal about meals along with his sister, Cera. I called and called and searched. I had to go to a meeting, so I thought he would come out by the time I got home. When I got home later that morning, he was still not coming out, and I was extremely concerned. I finally found him after searching and searching; he was hiding on the top shelf behind some boxes and still wouldn’t come down. My husband came home straight away; he was able to get him down, and we took him to the vet immediately. Initially, the thought it was just a UTI and blockage, but now they are thinking the UTI was just a symptom of something larger going on. He’s been there for 3 days and 2 nights (tonight will be 3 nights), and they still don’t know what’s going on. This is going to be a huge unexpected expense when our family is already strapped really tight. We hate asking for money and understand many are in similar positions right now. However, if there is any chance you can help at all, we would be extremely grateful!