Please don't take chances with "ear pain" if it's lingering. Get it checked out. It could be due to your treatment, but it shouldn't be a constant, consistent pain. My ears seem much more sensitive to "touch", glasses sitting on them, etc., and I still get ear aches on the oppisite side as well, but they aren't consistent. My Dr.'s said that can be a "normal" (whatever normal is) occurence, but if it's consistent they want to know about it, so share your concern with your medical team.
Best Wishes,
Steve