I have extreme episodes of rock hard abdominal distention. ct ruled out bowel enlargement and ascites. angioedema ruled out. what else could it be?

"Digestive Disease": Many digestive problems are associated with transient episodes of bloating including gallbladder disease & irritable bowel syndrome, to name a few. I suggest you see a GI specialist: if all organic causes are excluded, it is likely related to your diet, in which case you may benefit from working with a nutritionist. Good luck!