Welcome Joe!
I don't believe I have had Crohn's for very long (I am not "officially" diagnosed yet, but I am hoping I will be sometime soon), but I have noticed that my symptoms seem to come in a particular order.
When I first started having problems, I remember getting the mouth sores, next was the big "D", and then my eyes flare up, and the arthritis kicks in. I was on prednisone for a little over a month, about 2 months ago, and it all got better. Then everything came back but worse this time, in the same order. It seems like my extraintestinal symptoms are more prominent and constant than my actual bowel symptoms are.
I sincerely hope you are able to get some answers soon! This disease can be so frustrating! My Internist and my Opthamologist are frustrated because they know something is going on but the first GI I saw would not diagnose Crohn's and her report actually conflicted with the pathologist's report (go figure!).
Take care and keep us posted!