Welcome to my nightmare

Haven't you ever felt you've done something before, but when you think back as to when that was you don't remember? I sometimes get this feeling. A feeling that leaves me questioning as to why I know how that feels. The feeling involves falling. A deep fall, into the ground. A fall that leaves me feeling helpless. Perhaps even lost in that fragment of time. I think this feeling comes from a past experience that I perhaps don't recall. I sometimes also feel as if these dark feeling comes with the deepest parts of brain. The area that focuses on fears. Fears that I have yet to find out. Perhaps I fear the feeling of being helpless, rather than falling. Maybe the reason why I feel as I have taken a great plunge down to the ground is because other scenarios like that have occurred. Scenarios that resemble the same criteria. Who knows why I feel this way. Not me, that's for sure. All I do know for certain is that this feeling strikes me in a big way. It leaves filled with freight of perhaps feeling it again, but this time in a conscious matter. A real life moment, in which I have no control over.