** Thanks for contacting with your health concern 1. As you are a diagnosed case of IBS- D [irritable bowel syndrome predominant diarrhea] and have been to 3 gastroenterologists and the symptoms are still persisting/returned, call your doctor since it can be symptoms of underlying illness or infection which require medical intervention. 2. going by your history and symptoms, the most probable diagnosis could be functional IBS [irritable bowel syndrome] which is a collection of symptoms ranging from bloating, diarrhea, abdominal pain, and constipation, and because in people with IBS the body is unable to absorb vitamin B12/Iron thus suffer from chronic anemia, so check with your CBC [complete blood picture] and Vitamin B12 level for pernicious anemia, since presence of both does cause weight loss [present] apart from nausea/vomiting/loss of appetite, till then i. maintain proper hydration [to prevent dehydration] and replace with electrolytes [avoid apple, grapes, pear juice which can make stomach upset]. ii. Avoid fiber-rich diet, since it can make bloating/diarrhea worse [instead take plain white rice, boiled potato, plain toast] - avoid eating dairy products, spicy food, and spicy condiments, stay away from artificial sweeteners. - take less of strong spices (ginger, garlic), oily-fried-fatty food and flatus producing foods (peas, beans, dals) - eat slowly, avoid haste-irregular eating and sweet/heavy food which are difficult to digest and cause indigestion - since it is a psychosomatic disease thus tranquility of mind is must, as such Medhya drugs or a mild tranquilizer are useful.