Thank you for your query.
It seems you are suffering from some gastrointestinal infection
, that is causing cramps and pain after eating.
It could also be severe gastritis
You could try eating small frequent meals, with more liquids, spread out through the day.
Avoid spicy, oily, greasy food and take meals / liquids every 2 hours.
try increasing probiotics ( yoghurt, sporolac plus tablets ) in your diet.
If not relieved, it is better to consult a gastroenterologist