Don't panic, if you are a seller you should be more careful in seeing the sales chart in the portfolio. Just hold your coin, sell back in the coming months. Take it easy, many people will be with you. In the long run the coins that you hold will be valuable and more expensive, depending on if the project you are following is good and not fraudulent.
As of now the price is decline hold for a moment and calm and perserverance to wait until the price in the market become stable.