Does anyone know where their emetophobia comes from?

I’ve had this absolutely horrific life changing consuming fear (as y’all can relate to) since I was around 5. I remember I got sick and it wasn’t even the first time.. but from then on I was never the same. I have a lot of childhood trauma but what is this from? Why are we scared of something that other people can do perfectly fine? How deep does the anxiety go? Please share why or how you developed emetophobia if you’re comfortable.