From time to time, I dream that I want to go downstairs, which is very difficult and horrible. What is the reason? I dreamed it several times.

You are doing something now, but you are under great pressure. You care about the result and are afraid of failure, so you dream of falling off a heavy bridge. I think you dreamed that you fell in the middle and late stages. If it means that what you are doing now may fail for your own reasons. I suggest you relax recently and face it with a normal heart.