Marybeth--sorry to hear you are having such pain...Have you contacted your doc? I know that people with CD aren't usually candidates for a J-pouch because of the nature of our disease. Maybe there is something going on that needs to be addressed. The only time I have had some similar problems was when I had an abscess on my right side.
Don't live with the pain too long...Let us know how things go.
You might want to post your question at www.jpouch.org There are over 6000 jpouchers on that site that might have an idea for you.