Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM).
You are having chronic diarrhea
and for which you require evaluation. But you haven't mentioned reports of investigations you have undergone.
You have to ask your doctor to test for HIV test
on you as chronic diarrhea may be a manifestation of HIV
I hope I have answered your query and this will help you. Remain in touch and get-well soon.