30 mins? That is fast. Have you had your gallbladder out or something? There are meds that help with dumping syndrome.
https://www.google.ca/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/Dumping_syndrome&ved=2ahUKEwjz-_rQyejYAhUKLKwKHW6LDi0QFjAOegQIFBAB&usg=AOvVaw1geiNq10LdP-Zg-n4HjwQx
https://www.google.ca/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/Dumping_syndrome&ved=2ahUKEwjz-_rQyejYAhUKLKwKHW6LDi0QFjAOegQIFBAB&usg=AOvVaw1geiNq10LdP-Zg-n4HjwQx