Hello all! I'm 26F, and I have the same genetic condition that causes fainting goats to "faint".
It's called Myotonia Congenita, a rare muscular disorder affecting approximately 1 in 100,000 people. For comparison, your lifetime odds of being struck by lightning in the US are about 1 in 15,300!
With that said, neither I nor the goats actually lose conciousness when we fall. Myotonia Congenita is a muscular channelopathy, meaning the chloride channels in my skeletal muscles don't function properly. This interferes with the electrical signals that control muscle relaxation, causing my muscles to stiffen or temporarily lock up after contracting.
The condition can also cause unusually large muscles that develop with relatively little effort, despite sometimes experiencing profound muscle weakness. Similar forms of myotonia have been observed in dogs, cats, and of course, goats! There are also paralytic and dystrophic variants found in humans.
I was diagnosed at 19 via genetic testing. I am happy to answer any questions about my condition, it's effects on ny everyday life, and what it's like being a human fainting goat!