Poor digestion/weight loss. unable to eat most foods due to gas. limited to vegi diet - again only leafy vegis. all tests normal, docs can't understand.

Functional Approach: I would consider a detailed evaluation of your overall health, nutritional intake, as well as gastrointestinal health. A functional medical approach would likely uncover some issues in regards to your digestion and assimilation. An in depth stool analysis is a good place to start in regards to digestive issues. You might also benefit from seeing a gastroenterologist.