Onyx needs help post surgery

I took onyx to the vet after she stopped eating. we thought she had a blockage since I'd found a chewed article of clothing and some fabric in her vomit. they took x-rays and her tummy was distended they said surgery now. they gave me a hard time about how much I could put down and wouldn't do it till I came up with the money. I gave them all the money I had in the world plus some that was raised quickly.  they found nothing, when I picked her up they said I owed $700 more. They won't send out the biopsies they took till I pay them the money. plus there would be follow up visit costs. now she is having complications.....she won't eat, she is cold and in a lot of pain.  please help me get my girl back on track to the goofy happy dog she used to be. she is only 4 years old, she deserves more time!!!! thank you from the bottom of my heart!!!!