I agree with Mike. The problem with crohn's is sometimes it expresses itself as a simmering problem. It doesn't flare up and cause terrific problems, so sometimes symptoms are tolerated for long periods. But cumulatively the results of this simmering inflammation is layers and layers of scar tissue. By the time the symptoms are intolerable -- bloating, malaise, partial obstruction, full obstructive episodes, pain, cycles of diarrhea and constipation -- the damage has already been done and surgical intervention offers the only prospects for relief.
about the frustration you are feeling about the examination, again Mike is right. Not only can a colonoscopy not visualize much beyond the TI, if that is where your stricture is, it is quite likely the scope can't pass through to evaluate the actual area of inflammation/scarring. You definitely need further investigations but SBFT is not the gold standard. pill endoscopy or CT enteroclysis would probably provide a more definitive result.
In the meantime, what is the problem with a course of prednisone. If you get relief from symptoms then it might be time to consider use of immuno-suppressents or at least an anti-inflammatory like Pentasa. Immuno-modulators like Remicade or Humira may not be the answer in your case since either might actually exacerbate the stricture because healing, when it occurs, is often very fast. that can lead to more scar tissue.
If you don't achieve a response on medication and you have run out of medical options, there are still some options besides resection. They range from balloon dilatation to stricturplasty neither of which results in resectioning the bowel. If you do require a resection, new surgical techniques allow the resected ends to be fashioned so that the small bowel is actually secured in a transverse (sideways) position allowing for a greater opening than if refashioned end to end.
You have the evidence now, that these "IBS" symptoms you have experienced since 99 were in fact symptoms of crohn's disease activity. (strictures do not develop overnight. they are the result of long-standing crohn's activity). I hope you will be able to use this self-knowledge in the future to ensure that your health care providers listen when you complain. Remind them of these findings. Do not allow your symptoms to be brushed aside. What you experienced since 99, this is what crohn's disease feels like for you. They are not symptoms that should be ignored. Even though they may be more tolerable than the symptoms often described by others on this site, they need to be attended to with just as much vigilence as someone experiencing fevers, bloody stools and intractable diarrhea.
I am so sorry that you again find yourself in this position. Hope you can find some medication that will reduce your suffering and stave off the need for surgery.
30+ years living with Crohn's.