That particular trade was not entirely your fault. There was a bank intervention by the Swiss national Bank (SNB) and the price jumped a lot of points in less than 1 minute. Even a stop loss would not have been able to save your account if a 400 point move would have blown it. This is because the broker would hot have been able to fill in your stop loss at the speed of the price move. The best way is to be aware of when there are going to be bank interventions (fundamental analysis). Then you can avoid opeining positions or large lot size positions during such itmes.