I have had a jpouch since 2009. I just spent six days in the hospital for my 1st severe blockage. I have felt it before but was always able to resolve itself with water and massaging the area a little (pushing like hell in my intestine really where it felt clogged). But they said it was nothing I did and I am getting scoped tomorrow to see what it looks like after a few weeks on Steriods and a couple on Flagyl. It was extremely painful at times and the hospital stay, well those are never good. The biggest mistake I made was going to a local GI instead of my state of the art Mass Gen/Brigham and Womens doctor who is one of the best literally.
I am back with him now never to go "local" again. He said you need to get scoped every year so this does not happen. Last scope was years ago and my local doctor didn't see why I needed one every year. He also told me after not coming to the hospital or answering my calls for 2 weeks that he knows nothing about jpouches and can't help me after 6 years with him. Lesson learned, get regular scopes, you do not want to go through it trust me, no fun at all.