Congrats on the new job. Chicago is an awesome place. I love it here.
Two hospitals you should avoid at all costs, Jackson Park Hospital and Saint Benard. Two of the worst hospitals in the country, if you ask me. Both are located on the southside.
Some good hospitals to check out are Weiss (I think that's what it's called) Hospital, Illinois Masonic and Swedish Covent, all on the northside of the city. On the southside, Trinity, Christ and Holy Cross are great hospitals.
Check out those places. I'm sure they will have a good GI doctor for you.