Can you please elaborate on your symptoms?
Thanks for your response.
How long have you had the diarrhea?
Have you had the colonoscopy over the past 3 months too?
In your case since almost any other significant disease has been ruled out, Irritable Bowel Syndrome remains a strong consideration. Has your gastroenterologist ever discussed that possibility with you?
Yes, most definitely.
IBS can cause (most commonly) abdominal pain or cramping along with bloated feeling and flatulence, diarrhea or constipation with mucous in stool.
You can read up more about it at:
I'll be happy to answer any more questions.