First step would be to get a diagnosis for both the urinary and bowel issues:
> is your urinary issue a bladder, sphincter, urethra, UTI, if related issue?
> is your bowel issue proctitis, rectal/bowel injury, or ulceration. (Have they done a colonoscopy to look for any damage?)

Did you strictly adhere to your full/bladder empty bowel routine?
Did you use a rectal spacer?

If this is not within your rad onc’s field of expertise, he should refer you to o’a specialist.