Quote Originally Posted by Cinder & Smoke

The "attempting to pee" with nothing being produced sounds like a
Urinary Blockage ... and not "just" a UTI.

Ask the Vet if he checked the urine for traces of "Crystals",
and/or if there's possibly a "stone" blocking his bladder.
On the message the vet said no crystals, and other than the blood everything else looked fine, but I will ask him when I actually am able to talk to him. We've been playing phone tag all day. Yesterday he was peeing in small amounts though, when we went to the vet his bladder wasn't very full as he peed in the carrier on the way over. I'm also checking the litterbox since he is isolated and he is peeing, today the pee biscuits do seem bigger than yesterday, they are still small in comparison to normal though.