Well, we have good news 
The results from the urine and stool samples are that he doesn’t seem to have an underlying condition. There were some red blood cells in the urine, and some unidentifiable crystals, but mostly it looks quite normal. He is on antibiotics now as a precautionary measure, and we’ll be doing another urine test next week to rule out any feline urinary syndrome.
He’s home now, and quite happy, as are we. I can’t say I’ve ever been so happy to see him sleeping on the bed before. I was trying not to be worried, but having him back made me want to cry with joy. I love that little guy so much. ~sigh~
