Wow, I had no idea that the science around the vagus nerve had progressed so far that we actually have implants that can be used in humans. Amazing. I'm so happy it helps your child.
I was really skeptical that any of these nerve stimulation devices would work over a decade ago when the hype first started growing around them (among biotech investors, not the public). It just sounded way too good to be true but since then there have been a number of devices treating migraines and seizures that were previously intractable.
Really happy to be proven wrong!