Consult GI. Could be IBS or IBD.

There are many causes of pain after eating. A differential may include a stomach ulcer, food allergy, lactose intolerance, gallbladder disease, pancreatitis, and inflammatory bowel syndrome or disease.

It could be anything such as ulcer, gallstones, liver, pancreas problems, even your heart. Go to your primary care provider and request that they test those parts of your body with ultrasound, blood test, and heart test. If it is severe, go immediately to the emergency room for examination. DO NOT WAIT UNTIL IT IS COMPLICATED.

Check gallbladder for Dyskinesia, maybe also get EGD. Finally could be a food allergy like lactose insufficient.