I have been diagnosed recently with a celiac artery ameurysm during diagnostics for a pacreatitis attack where I subsequently had my gall bladder removed. It's currently 2.3cm and I was just wondering about symptoms. When laying down, supine or prone. I have no discomfort. When I stand, within minutes I get nauseous and this does not stop until I lay down again. Is this due to the left gastric artery being impeded somehow due to gravity?