Layla has pancreaitis (many yorkies on here do) but thankfully didn't have any symptoms. I home cook for her- very low fat diet- I am starting to bring a few healthy fats back in (mainly fish) and she is doing great. I used a nutritionist.
Holistic Veterinarian Pet Nutritionist Holistic Pet Care and I would suggest you look at her site and if you were going to get a consult- i would suggest doing the consult with the vet as well since your yorkie has multiple issues. Hoping tomorrow is a better day for him.