I knew it is really difficult decision to make in a situation like this but just to play safe you should sell your coins immediately if the value will reach equally to the lowest price you purchase your bitcoin and considered it an equally balance with nothing to lose then if it will reach lower you have the option to buy it again but if it rise up again then buy it as new base line of your investment at least you did not lose from your capital but only your time is wasted but that's the facts of trading. You will only sell your bitcoin in case of emergency but if not then continue hoarding.