Do you have any other symptoms? It could be many things like celiac disease or just gluten intolerance or crohn's disease (but I would think you'd have mentioned other symptoms with that one), etc.
Welcome to the gastroenterology community! Have you tried eliminating all lactose from your diet for at least 2 weeks? Do you drink any carbonation? Is the gas painful or just that you are having a lot of gas? Does it smell really bad or just normal?