Not sure if this is new to you or not. However, the facial nerve has five branches on the face, going to the forehead, eye, mouth, and the NECK. So, if you are having spasms of the facial nerve, I could see how it easily affects the hearing, balance, ringing AND give spasms on the neck or anywhere else on the face.
However, as harsh as this sounds, some of these symptoms you need to do your best to live with them. For example, I have loud ringing daily and complete facial paralysis. However, my nerve spasms are more minor, but more aggressive nerve spasms are NOT unusual. As discerning as they are, and I know it's tough, do your best to ignore them. The head aches must make this even more unbearable.
Personally, I would seek a second opinion with a facial plastic surgeon and a brain surgeon. The facial plastic surgeon may be able to help alleviate some of the spasms, with temporary treatments. Not sure, but I would ask. You should seek a facial plastic surgeon that has experience with facial nerve reanimation. I'm sure there are many. I went to Dr. Boahene at Hopkins.
I agree an AN or Facial Schwanoma surgery could impact the eye, swallowing and tongue nerve. I had a high probability in my case, but tumor was 4.5cm. Surgery after radiation, I'm told, is more difficult. The surgeon would be able to draw an initial assessment using your MRI.