Go truly RELAX your stomach, come back and apologise for posting such utter bollocks!!
I have full control of my diaphram and can execute a vacuum, a rope, vertical and horizontal abodominal waves, and GROSS distensions. I can also breathe one lung at a time and circularly (inhaling one lung, and exhaling with the other).
I understand how breathing works very well, and I can tell you that my stomach does not come past my chest even when fully relaxed.
Now maybe you should consider the contents of your gut. I would bet dollars to the donuts your GUT is swollen with intra-abdominal fat.