Suggest Remedy For Reduced Appetite, Vomiting And Reducing Weight In A Toddler

Hello sir, my daughter, 2 1/2 year old stopped drinking and eating anything.....If I force her, she vomits. Through out the day she drinks 150 ml milk and eats 2 spoons of rice...thats it...what ever I offer, she rejects immediately. She was a healthy child before weighing 13 kgs on her 2 nd birthday. But now she is reducing her weight and becoming thin.....She is very active still. Somebody suggested me to give her cypon syrup. Shall I give her? I am worried and deaparitely waiting to hear the suggestion