I agree - it's time to get checked out. Strictures are a common complication of the pouch, and the risk for stenosis (narrowing) increases over time. Obviously having an older pouch would put you at greater risk. The good news is, most strictures do not have to be treated surgically, and you can be dilated right in the surgeon's or GI's office. You may have to do follow up "self maintenance" but this will be demonstrated to you.
Hope you get this sorted soon!