I am so sorry your both going through a rough time.
I can't not help you but wanted to send a prayer for your
little one to get better. I am sure there will be others
who can help you with suggestions.
Do you know the list of foods that are toxic to a yorke?
Hopefully none of those foods were fed to him.
Grapes, onions, garlic, chocolate, raisins and others.
Good luck and get well little guy.
Carol & Buddy