You know what? My GI has always been fixated on the fact that I have ulcerative proctitis, because that's what it was at diagnosis. I have been having a severe flare, and it is quite obvious to me that the problem has become more extensive, but he doesn't want to scope me because I am pregnant, and still tends to refer to me as having proctitis.
It didn't seem that he was taking my symptoms quite seriously enough, so I collected my output (gross, I know) over a 24 hour period and took it in to show him!! I produced a full litre of bloody mucus, which prompted him to put me into hospital immediately on IV steroids and IV fluids as I was also severely dehydrated.
If you need to give your doctor evidence of your condition, just do it!!