I guess I'd call your doc, too and see what he says. Basically, from what I've read, it seems like if your symptoms start to come back when you try to taper, it's best to bump back up for a few more days, then taper more slowly (ie drop down by fewer mg).
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 nightly,
40mg 30mg 20mg 15mg of Prednisone (quick taper), Culturelle probiotic, and Zoloft (25 mg).