I've had a similar reoccurring dream when I was young as well. Only I was standing at the end of a endless, massive hole in the ground. I saw myself as only you can in dreams and I saw all these nightmares surround me. Rather then succumb to claws and gnashing teeth -- I plunge into the hole. I always wake up though when I do. I escape the fate of it.
The dream continued for only 3 years. But I'm surprised you didn't wake when you fell. I always did.
Somehow I knew I was going to be alive after the long fall