I think I feel the same thing but I had HDR Brachytherapy.
Of course, I've had internal hemorrhoidal pain since my biopsy last October and I've been taking a lot of stuff, both ways, to help that situation. I can't tell if it's the 'roids or the radiated prostate.
I also saw a surgery member, Pratoman maybe, say he felt a similar feeling since his was taken out.