I do agree that such dreams could be are rooted in worry. Sometimes i have dreams where i am riding in a car and the driver drives off a bridge. In that moment i am forced to resign to death. My fear stems from a mistrust for something that far from the ground. Death has more potential in such places.
I also might interpret You are a person whom prefers to be on neutral ground, and not in a place of disadvantage. In other words you like to be in charge of things. (Maybe from a more earthly standpoint.)
Water- symbolizes unconquered terrain, mystery, potential danger There is something out there you are not sure of that poses a threat (or maybe thats just what you think.) Fear of the unknown.