I am so sorry to hear you are going through the facial challenges. I have come to think it is not rare, or there are more people doing radiation but are fine, only us that didn't do well are on this website....doubtful.
So I did botox and it definitely balanced my face, not perfect, but much better. The one challenge I see is that my eye does not close when I blink, so this is the challenge. The botox helps with the resting face. But once you blink my face is not symmetric. But I am happy with the resting face. The eating got better too. It's not like before, but it is better. I also have to wear an eye mask or sleep with that eye down to make sure it stays closed while I sleep, dry eye in the morning. I know I am not sounding too positive as I write this, but is is better then not having the botox.
This is a very personal choice but I am glad I did it. I am on round 2 if that helps. I would also say that the eye thing is more at the first, but does get better a few weeks in. I would also say my face was better after the 1st dose, not sure if I will need another one. It has given the nerves time to hopefully grow back correctly.
Good luck on your decision and please keep us posted.