Just wanted to quickly comment on: "have no morning stiffness or soreness."
I was diagnosed with AS when I was 16, now nearly 22 years ago. And I don't recall ever having morning stiffness. I vaguely remember feeling bad in the morning before my lumbar fused, but I think that had much more to do with not being able to sleep because of lower back and hip aches.
I always used to get annoyed with rheumies because they didn't seem to want to believe I didn't get it as I am such a classic AS case apart from that.
As I was only 16, I've no idea what the specialists based their diagnosis on. It definitely wouldn't have been on X-rays or similar, because nothing would've shown yet. I think the colonoscopy was vital in their assessment as it showed Crohn-type lesions.
To me it sounds like you may need to find another specialist who will recognise colours other than black and white!
