Thank you for providing quick additional info.
If all other causes has been ruled out, then most likely cause of your symptoms is irritable bowel syndrome(IBS).It is not a disease. It’s a functional disorder,meaning that the bowel doesn't’t work, or function, correctly. Its causes are unknown.
Symptoms can come and go repeatedly without signs of damage to the GI tract.Irritable bowel syndrome (IBS) is a problem that affects the large intestine.
As you have undergone almost all the tests of GI tract & all of them are normal,so most probably the cause of your pain & other symptoms is irritable bowel syndrome(IBS).
The prescription medications approved for the treatment of IBS are: Alosetron (Lotronex) and Lubiprostone (Amitiza).
There are other anti diarrheal medications.Also you may need anti depressant medications.Taking probiotics will increase the 'good' bacteria in the gut which will help to ward off 'bad' bacteria that may have effect on causing IBS symptoms and pain.
So I advice you to consult your gastro doctor for these prescription medications that will help you greatly.Till then take tab. Loperamide
to stop the diarrhea & loose stools.It is available as OTC(over the counter) without prescription & will help you greatly.
Hope this helped.
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