Thanks for posting your query.
Your disease is called as "chronic diarrhea" as it has multiple causes.
Do you have abdominal bloating/ abdominal pain/ increased gas formation/ blood in stool?
What was your UGI endoscopy
Have you undergone duodenal biopsy?
If all investigations are normal then you may have IBS
predominant diarrheal type/ small intestinal bacterial overgrowth.
You should avoid milk and all milk products.
You should consult with gastrophysician and should take rifaximin, probiotics, anti secretory on written prescription.
Get well soon,
Dr. Mayank Bhargava