thanks for the update. I hope the vet has some positive news for you.
Have you discussed Nutri-cal with your vet? For days when Chandler has no interest in eating? It'll give him a boost of energy and some vitamins. And since it's a gel, you can easily rub it on his tongue or the roof of his mouth, so he'll have no choice but to swallow it.
I don't know if it'll be a problem with his current medical conditions and medicine, so maybe you can ask you vet when he calls with Chandler's results.
Here's a link
http://www.petco.com/product/7708/Tomlyn-Nutri-Cal-for-Dogs.aspx