Now it is much more evident that it’s blood and blood clots throughout the stool. Does this sound like radiation protitis?
The short answer is, "Yes". I had the same symptoms after my Proton Therapy. Several other folks in my "graduating class" at UFPTI had similar blood-in-stools. Most (me included) healed without treatment after a period of time. I never had any pain.
As far as your pains are concerned, I've never heard of anyone with that problem.
Obviously, your Radiation Oncologist is the best person to consult.