Well, after the steroids it's not surprising that your c-scope didn't show inflammation. I'd get a third opinion, too, but take the records from your last two c-scopes (including pics, if there are any) to your new doctor.
Status: Remission since late May 2009!
Symptoms began in November 2008, ~4 weeks after giving birth to my son.
Eased for ~3 weeks in December, possibly b/c of probiotic use?
Returned in January 2009 (with a vengeance), diagnosed with pancolitis on January 30.
Currently taking Asacol (400mg 4 pills 3x daily), Rowasa twice weekly, Culturelle probiotic, and Zoloft (25 mg).