Abnormal Bloated Stomach

Hi all,

  I am about 18 months out from surgery and at my goal weight.  The past few months I have noticed that when I eat I look pregnant as my stomach blows up like a balloon, so much that I have to loosen my pants.  I am watching my carbs and stay away from gas causing food like the plague, but it doesn't matter what I eat (small bowl of soup, a piece of baked chicken breast etc.) is this normal? I make sure I don't over eat... the minute I start to feel full I stop. It usually goes down over night or after a few visits to the restroom.  Is this s sign of a Hernia or something else?

Could the small amount you eat be something dairy?  I get that from straight milk and whey protein every time, and other things like onions and terriyaki sauce.  Sometimes it's not the obvious thing like simple carbs.  It took me years to figure that out.