Hi slash1953 and well done on finishing your radiotherapy. I’ve attached a link which covers some of the side effects which can continue for a few weeks after stopping treatment. It mentions stomach pain when passing stools. It may be that the treatment has inflamed the tumour a bit and that is what you can feel in your back passage and it can also bleed a bit especially when a stool is passing it. https://www.macmillan.org.uk/cancer-information-and-support/treatments-and-drugs/radiotherapy-for-rectal-cancer
Having said this I am not medically trained so please give your colorectal support nurse a ring if you’re worried?
