falling down

I have serious acrophobia, and I fear falling down, even if that just means tripping on a shoelace or something fairly harmless like that. When I fall asleep at night, I often shake myself awake after falling down in my dreams. I've never worried much about it, as I consider it a quirk of my personality.

Lately, I've become more concerned about this quirk. When I'm on or near stairs or ledges, I have brief flashes/visions in which I see myself falling down and injuring myself. The strange part is, I'm injured in these flashes, but it doesn't hurt. It's not that I desire this, but I see it happen.

I was standing on a balcony a few minutes ago, and had one of these flashes. I thought it was best that I move away from the edge, both because of the flash, but also because I feared the distance between the balcony and the floor below. It made me feel nervous and powerless.

Has anyone ever heard of this kind of a quirk? I'm neither depressed nor suicidal, so it seems strange that I would have these visions of something I fear so much.