The Cleveland Clinic is a prime example of the huge difference between teaching hospitals whose docs see lots of crohns patients each year and have superior academic credentials as opposed to small community or suburban doctors who don't have that much experience with crohns.
Go to their website and get the phone number to make an appt. If you have an HMO you may need to be referred to a doctor at the clinic - if your current GI won't refer you then that's confirmation you're seeing the wrong doctor. Move on to your GP for a referral. If you're not on an HMO you can "refer" yourself. You may have to wait a several weeks to get in but it will be worth it - and if things get really bad go to the clinic's ER - you may well get admitted to their GI service and you'll be on your way. Best of luck!