The vet called this morning and the news wasn't what we wanted to hear. We were hoping the lab results would indicate an infection that could be treated with antibiotics, but the blood work was normal, no infection.
We've taken him off all meds including his pain meds for arthritis and he's starting to feel it. He wants no one but me near him, so that's how it'll be for now. On Saturday when his system is clear of all medications, we'll start him on steroids to try to fight whatever is affecting his brain. We don't know what the possibilities of success may be, but that's our plan for now.
After not eating for almost a week, he couldn't resist a baked chicken breast last night as long as I hand fed him bite size pieces. He ate it all plus part of mine. This morning he had a little yogurt and another chicken breast. Once he gets started on steroids his appetite should pick up.