Recurrence of diarrhea after improvement following completion of radiation treatment - normal?

I thought I was out of the woods, but I guess not.  I finished pelvic external beam IMRT about a month ago for UPSC/clear cell, isolated tumor cells found in one of the two sentinel nodes.  I had horrible diarrhea during radiation treatment after the first two weeks.  About two weeks after completion of treatment, the diarrhea pretty much stopped, and I began to have formed BMs, even to the point of formed stools every other day.  I was eating pretty much only protein and simple starches, but I was able to add in melons and banana.  But a few days ago, I began to have abdominal bloating - even without having eaten anything - and now the liquid diarrhea is back.  I continue to take a Culturelle probiotic daily, and eat only protein, simple starches, and melons.  But even if I eat nothing, I'm still bloated, with perceptible upper abdominal distention.

I've read that it can take up to three months to get over the acute radiation injury to the bowel and bladder.  But I was doing so well - felt great, and solid, dry stools, even had to have a sip of coffee every other day because of constipation (my usual state).  Now I'm back to pure liquid stool, with rare fecal incontinence.

Did anyone who had IMRT have this on and off diarrhea afterwards?  Is there hope that I'm going to improve again, and stay that way?  I'm prettty discouraged.  Sure, I knew that there was a small possibility of chronic radiation injury showing up 18 months or later, but when my function returned almost to normal, I thought I'd be okay for the next year and a half, at least.