HELP!! My dog won't eat and is starving to death

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I have a two year old Yorkie-Poo. We had her spayed 2 1/2 weeks ago and things went great. We had her in to remove the stitches last Friday, and since she has stopped eating. Friday things seemed fine. At the surgery she was 7.0 pounds. At her peak she has been 7.9 pounds. Yesterday she was 6.0 pounds. She is nothing but skin and bone. I can feel all her ribs, her entire spine, and her hip bones stick way out. Saturday morning she threw up and wouldn't eat anything. So I made her some hamburger and rice (mild, at my vet's recommendation). She ate a little and kept it down, then pooped a big white nasty pile later that day. But she didn't eat anything more all day Saturday or Sunday. Monday morning I went and got her some soft food. She ate an entire can (small size), and threw it up about a half hour later. She hasn't eaten anything since. She drinks water regular, pee's regular. The vet took x-rays to look for a blockage, and found nothing. temp was normal. Took blood and did a complete workup and things were mostly normal. Slightly elevated white cell count, low electrolytes (from vomiting), and slightly elevated kidney enzyme which vet says is just concentrated since she isn't eating, but nothing to worry about. With the white cell count, they put her on antibiotics thinking she may have a slight infection or inflammation. I don't know what to do and am worried my dog is going to die. She hasn't kept any food down in over 4 days, and she has no weight left to lose. My vet doesn't seem real concerned at all, but she needs to eat. Usually he has been a great vet, but I am considering taking her somewhere else. Anybody have any advice, tips, or experience with something like this. I don't want my dog to die.