I still have some ear pain...mostly now when I press on the ear (as if to plug up my ears from noise) ...but I certainly remember after radiation I did have pain in the ear.
I'm told by others that the inner ear is affected by the rads...tender, red and can even have fluid on it ...my primary even said to me one time soon after rads that my ears inside were red / inflamed.
Good to report it all the same....no doctor here but I think you will find it is post rads normal
Best,
Tim