Oh my family never had good experienes with Kaiser!
I'll go against the grain here and say that getting symptoms under control is more important than a colonoscopy -- at least to you. More than that, if the colonoscopy isn't going to change the course of treatment or change the outcome, then it's unecessary.
I'd familiarize myself with ASGE guidelines and ask the GI to point out in them, specifically, why you need a colonsocopy before treating symptoms. A diagnosis is a diagnosis, and if your doctor can't trust the records of another doctor, what's the point of it all, anyway?! If the treatment is pred and maintenance meds, you do not need to satisfy your doctor's curiosity with scope.
Good luck. You may need to find another doctor in the process.