I don't want to concern you but my mother who was 50+ at the time had a large belly that seemed like she was pregnant. So she went to the doctor who found that she had a massive ovarian cyst. That was benign. The cyst also brings water to the area making things look bigger. If you haven't has something like that checked out you might want to.

But I have a massive stomach too, and I have had it checked, the only thing that seemed to work was a liquid diet. I believe that a lot of the liquid that says in your body with food comes flying out when you don't eat a lot of food.

One caveat once you start eating food it comes right back.