Natasha, it is so sad that you are having such a stressful time when you should be having a ton of fun with Poppy. My heart goes out to you, but at least you are getting the help you need and hanging in there to give Poppy the care she needs.
I can't imagine a breeder letting such a tiny, tiny baby go!
He cares nothing, absolutely nothing for the welfare of that tiny girl obviously. And I really think he knew you wouldn't bring her back to him, no matter what.
Please report him. Can you imagine what the other people and puppies might be going through? Especially the other babies! It is so sad. I wonder what the survival rate is like for those puppies who don't have someone like you to care for them?
Your doing fabulous.
Hopefully, Poppy will start eating, the vet will pronounce her healthy and things will become more relaxing and just enjoyable for you. Hang in there!