gumby...I have not gone through the 2nd opinion issue, but I do think you should keep your appointment. From past posts, it seemed your local doc was not offended at all by having a more specialized doc involved. I don't have the impression you would be doing any damage to your relationship.
I also think that you should send a note to the Chicago doc in advance with the tests and/or meds you think should be considered so you can maximize your time out there.
As for post resect feelings...mine was so long ago and emergent due to rupture that my experience may not apply...but I can say it took me at least a year to fully adapt. Of course I was new to the whole dx at that point too. But, I think you need to relearn your bodies rhythms and also know that you are not "perfect" just because they cut out a section. I look at your experience as a test ground for what may be coming my way. My expectation is to have to relearn diet and getting the "poop on schedule" for at least 6 months post any future resects (especially since I am older than the last time and not in as good a shape). You know...relearn how to keep all the plates spinning!
Go talk to the Chicago doc if for nothing else than peace of mind...I think it is worth it.