Rustycat and Chico--thanks to both of you for your kind words.
I must not have been clear in my original post, but Garney was taken back to the vet on Monday, 2-15. That's when the blood in the urine was found.
I made the initial post here on Tuesday night as he was getting worse.
On Wednesday morning, I took him to another vet who did a complete blood workup. It appears he has leukemia, has had it for a long time apparently and the cancer has spread through the blood to his brain.