Max's Human, I know how you feel! Before my Abby went to the rainbow bridge, my husband and I spent a disturbing evening at the emergency vet clinic trying to find out why Abby had blood in her urine. She'd been spotting for several days and it got worse all of a sudden.
Turned out she had stones (struvite calculi) in her bladder. We tried changing foods, but that made her get diarrhea! We eventually had to have her put down because her body just couldn't get straightened out. I sure hope Max does better!!