I wouldn't encourage a scope, it's likely to irritate your gut even more.
Sounds like you are experience a pretty typical flare.
I agree try upping the asacol.
But if I was making no progress and immodium didn't help at all, like you describe, I would have started prednisone.
49 year old female attorney, diagnosed UC/pancolitis 1985.
Asacol for 20+ years with Prednisone & Rowasa for flares (But nothing since Remicade).
Food sensitivity test by Naturopath showed wheat/gluten, other intolerances, helped some.
Remicade started April 2009 (Humira denied) and doing great~ learning what normal is~ wow