@michelles123
I'd like to add my welcome to Lisa's and also welcome you to Connect. I'm really happy to see that you are reaching out to learn as much as you can about your rare disorder. I did find an interesting article in the Journal of Neurosurgery that might be helpful in learning more.

An investigation into quality of life improvement in patients undergoing microvascular decompression for hemifacial spasm
-- https://thejns.org/view/journals/j-neurosurg/128/1/article-p193.xml

John