I have a 1.5 year old girl, Juliet. She was recently to the vet with a lyme disease scare. $340 dollars later -She is perfectly healthy!

She had been showing odd symptoms and not acting like herself for about a week. She wasn't eating, blood in her stool, vomiting, total lack of energy. The vet gave me some medicine for her stomach and said she was just suffering from an upset stomach. 2 weeks later, I can't get her to eat. She has always been a VERY picky eater, I have had her on a diet of boiled chicken and rice for 2 weeks. She won't eat it anymore so I was giving her hard food with chicken and she still wont eat it. She will eat something for a few days and then "get sick of it". I CAN NOT find a diet that she likes as well as being good for her. Any advice??