Hi.
Thanks for your query.
Thanks again for a good history of the pain, the relieving factors and explanation of the loose motions - the bowel movements. 
The most probable cause looks to be 
enteritis without fever and this can occur in many incidences that the infection is not severe enough to cause fever or the gram negative - a type of bacteria do not cause fever. 
The pain explains this.
I would advise you the following:
Get the blood tests : CBC, Widal for 
typhoid, 
Blood culture and sensitivity if you have not been started on antibiotic. 
Tests of urine
Tests of stool, culture and sensitivity
Ultrasonography
This will give us an idea.
Get started with the most proper antibiotics and 
metronidazole, 
probiotic and so on 
I hope you will get the results in 3 days, continue the treatment till you are cured. 
Avoid all foods and beverages which cause such problems.
use boiled and 
cooled water .