Thanks for writing your query.
After reading your post, it seems that your symptoms are due to over eating and indigestion
I would advise that you should take an antacid like Omeprazole
40mg once a day before meals along with Domperidone
30mg. Digestive enzyme
preparation containing pepsin and fungal diastase after meals will be helpful.
Also get your stool examined.
Avoid heavy meals.
I hope this is helpful to you.