It would not be unheard of for the inner ear and the Eustachian tube to get inflamed and irritated/swollen from the radiation treatments. By products of that could be dizziness, and the sensation that the ears are plugged/pressure. The question that I would have for the Radiation doc is does the field of radiation need to be in that area, and given this is a very targeted therapy, could that area be avoided for some portion of the treatments to allow this to resolve while continuing in the area of primary concern. Obviously if there is suspicion that the cancer has included any region around your TMJ or where the inner ear is in the field this is not going to be possible, but you doctor should at least be willing to talk to you about it and options/drugs to control the issues. I would approach the doctor with your feelings about him/her not being attentive to your side effects and see what they reply with. Communication has to be two way, if you are having symptoms which are not managed, is it because they just cannot be, or for some other reason. Answers would give you the understanding that you are just going to have to tough it out or that you might be able to get some medication to relieve things.