Well.... I got home and he's still with us and has been eating again. This morning he ate some bacon and eggs and took his med's. He's all skin and bones and it's sad to see how unhappy he is. He doesn't seem to be in pain, but he just sleeps and mopes around. Occasionally he gets a little spring in his step, but mostly he just looks pitiful and stands around, not knowing what to do with himself.
He's still on prednisone, amoxicillin and mycophenolate Mofetil. The last med is an immuno suppressor.
I'll talk to the vet and see if there are any other options, but it sounds like it's autoimmune, chronic and fatal.