Sometimes excessive gas is a sign of SIBO (small intestinal bacterial overgrowth). This is usually treated with several months of an antibiotic (commonly doxycycline or the much more expensive rifaximin). And sometimes gas is just...gas (from beans, sodas, swallowing air while eating quickly, broccoli, etc.). If you haven’t had a pouchoscopy before it’s probably worth a look, though the information probably won’t be life-changing. I guess lots of gas over an extended time period might dilate a pouch, but perhaps your doctor will come up with additional possibilities. 

Yes, “radiocontrast agent” is fine in English. It’s sometimes just called “dye,” but that’s less accurate.

Thank you, Scott.