Just wanted to let you know my situation as it is similar in a small way. Since i had my resection in 99' i was never put on maintenance meds - even to this day! Although i was managing well just taking Questran and appeared to be pretty much in remission, the crohns has slowly come back. But i was told for years by doctors that my D and bloating was IBS - never accept this - it's a cop out. Also all of my bloods showed up negative for Crohns/ inflammation. SBFT & Colonoscopies also showed nothing, but i insisted on the Pill Cam test as i knew there was something more than IBS stirring up inside me. Low and behold the Pill Cam showed inflammation in the part of the small intestine that the other tests cannot reach.
So my point is to insist on getting the Pill Cam for a definite conclusion. The SBFT can show alot but as i said, there are some parts of the bowel that this test just cannot reach. As Matthew said, with fistulas etc. it's almost definitely crohns. You didn't go through a year of hell to be told you have IBS. And you should not be med free if you have crohns.
Obviously it would be great if you genuinely don't have it, but either way you need a definite answer from the professionals. Stand up to these guys and don't be fobbed off.
Hopefully they will go with the Pill Cam test.
Keep us updated on your progress, and best of luck