Alright, thank you Mrs. D. I'll post there to see if there's any ideas.

I thought it might be nerve damage as she has no other symptoms other than the voice coming and going

I agree with you on the Lidocaine. I didn't see how it could work, but apparently it was an experimental treatment option that seemed to work. She had said the other thing the doctor wanted to try was Botox--but as I said, I don't know how something that will numb or "freeze" the nerves would work.

I'll be sure to look into the provided links. Thank you again.

All the best.