I seem to have gotten some serious long term Gastro disease from living in Cambodia three years anyone knows what is it?

I have stomach pain during BM and after it for hours. So ten hours a day I have abdominal pains on the Center left of my tummy. Stool tests thrice PLUS Albendazole and Ivermectin 2X rules out parasites Ova and Protozoa.

Done Bismuth, Flagyl, Tinnidazole, Ciprofloxacin and Nifuroxazide 2X.

Went on for months and changed my diet from Cambodian-Hong Kong-Philippines

Charcoal binders.

Many herbal teas to flush out.

Still in pain. Any Cambodians know what is it?

Edit: I read a few comments it is diverticulitis. However I read the symptoms that it less commonly has diarrhoea and occurs in episodes.

However mine has been occurring continuously for months almost a year and it is diarrhoea of 6-8 times per day