Thanks for writing your query.
After reading your post, it seems that you might be having infection of the gastrointestinal tract and needs medical management.
I would suggest that you should get your stool examined for any infection or parasitic infestation.
I would advise that you should take an antacid like Omeprazole
40mg once a day before meals along with Domperidone
30mg. A probiotic along with digestive enzyme
preparation containing pepsin and fungal diastase after meals will be helpful.
Antibiotic and antiamoebic may be needed if reports suggest infection. Dicyclomine
can be taken for severe pain
Eat light meals prepared under hygienic conditions.
Also take care of your hydration.
I hope this is helpful to you.