still sick

My poor Ginger is still sick despite the medication we gave her following the visit to the vet four days ago. She is still vomitting and having diarrhea. Today was even worse than the last few days as she is starting to refuse food and water. Had to bring her to the vet today again and be put on the drip as she was losing water. I'm feeling terrible as she may not be able to come home tonight. We are still trying to figure out her problem. I really hope its not due to jealousy that's causing her all these upset..