Will eliminating wheat, sugar and potatoes, and other white stuff from my diet help flatten my stomach?

Depends: Depends on what the cause of the distended stomach is. If it is from excess gas, you need to find out if it is a milk intolerance, a simple sugar intolerance, and overgrowth of bacteria. There are many causes. I would suggest starting with a evaluation by your physician. Some stomach intestine specialists, can do breath tests to determine specific causes of distended bellies.