Dude, that just sounds weird. Does it stay bloated even when you're fasting? It could be so many things! Are you sure it's really your stomach? Not your liver or some other bloated, distended organ? Could be a fluid-filled cyst, a benign tumor, or any number of other goofy things. Does it change size? Is your stool ever bloody?
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.