Hi.
Thanks for your query.
Noted the history and understood the concerns.
All the symptoms of rumbling,
bloating,
diarrhea and cramping are suggestive of an intestinal infection.
I would advise you the following in such a situation:
Send the stool sample for test.
Blood for CBC, kidney, liver functions and sugar.
A course of an antibiotic active against intestinal infection,
Metronidazole, probiotics and activated
charcoal tablets should be helpful.
Also watch for the foods and beverages that cause the problem and stop altogether.
Use boiled and cooled water.
Fresh home-made food only.
All these things together will help you get cured.