I have a fear of losing all my teeth. It's been a reoccurring nightmare since before I had all my adult teeth. I would get loose tooth and fear it was already my adult tooth and I would have a gap. The funny thing is after a lifetime of this fear an reoccurring nightmares I mentioned it at a family gathering and discovered my mom and one of my sisters had this same fear.

Overall though, I would think you fear is about losing your dream. I think we all experience that from time to time, but in different ways. Or maybe I've just normalized my own fears, like how every time I've put in my two weeks notice at a job I'll be super terrified something will go wrong and the new job didn't really want me and I gave the old one away.