First let me ask? "15 to 16 btc?" don't  you know how many you hold? Now if you went into it to make a quick buck and you were too greedy to sell @ nearly $20k which would have almost doubled your money, then tough luck take it as an expensive lesson If you haven't sold them just sit on them as the price will go up and then sell either at a small profit or small loss. The volatility usually surprises  novices unfortunately.