Talk to Pediatric Gastroenterologist on Stomach Problem

My daughter is 4 years old. She doesn't eat anything. If I force feed her, she vomits. Her stomach is not good either. She is also constipated a lot. She had two urinary tract infections last year. we treated her. us treatment k bad ak do dafa dobara bhe ho gya tha then i give her cranberry, I got her checked by the doctor. The medicine she gave her was foro b12,syp. romega, or lipomax sachet, pediasure powder. She is giving all of them but there is no difference. Then she doesn't eat anything.please guide me something, any syrup for stomach issue jis Sy bhook bhe lag jay or khany lag jay