"Having gone through that to the point of actually seeking treatment, I'm disappointed my doctor wasn't aware of that option."

This is really surprising. If you Google 'blepharospasm treatment' and read a few articles, it's impossible not to come across Botox. And this isn't even recent... About 20 years ago, I did a project related to commercializing an innovative treatment of blepharospasm, and I recall contrasting this new treatment against the alternatives available at the time. Botox was one of them.