Vomiting and not eating.

Hi, I'm desperate to find out how to help my dog. 9 days ago (Monday night) she woke up in the middle of the night and vomited all of her food/treat from the night before. She vomited again the next day so I took her to her vet - he sent home sensitive dog food and said prob. just upset stomach. She didn't throw up and only ate a little for the next few days. On Saturday she threw up again and couldn't keep water down so I took her to emergency. All blood work (pancreas and general) and X-rays came back normal. Sent home with lots of meds. On Sunday night she ate a small amount of boiled chicken and drank water and threw up 4 hrs after. I couldn't get her to take or keep down any meds and by Monday she was vomiting bile like every 15 mins. Took her to emergency again and they hydrated her and gave her nausea and Pepcid shot. On tuesday I took her to her vet and they put her on Iv but they didnt want her on any nausea meds. When I brought her home she vomited 3 times (twice after water and once before). On Wednesday (yesterday) i took her in to the vet and they did barium X-rays - all fine and nausea/ Pepcid shot. She hasn't been vomiting really since (only a teaspoon once or twice) but she won't eat. I've tried everything - boiled chicken, rice, sweet potato, yogurt, ground turkey, blending ground turkey with water, baby food, etc. She tried a few bites of the turkey last night but had a hard time swallowing and would spit most of it out after she put it in her mouth. She was holding water down last night and shes still on nausea shots. So far doc thinks she had gi upset and now her espohagus is irritated. I'm sure she will be back at vet today to do Iv again. I'm thinking about asking for pain meds if he thinks her esophagus is too sore. Could that go on for over a week? She's only eaten a very small amount in over a week and I'm so worried about her. She seems so tired and stressed out (she gets bad vet aniexty and anxiety in general). I'm just not sure where to go from here and I'm just hoping we aren't missing something. Thanks.