After a losing trade I take a nice big deep breath, accept it, analyse and try to learn from it, so I will not do the same thing again and again
When you lose most of your money, you should keep a track of your actions and should focus on what you so and how you do. Actually you lose money when you make wrong decisions and that occurs when you do not focus on the market and the latest information.
Anyhow, focus again and have patience for the panic selling always results in loss. Another way is to hold your coins and wait for the market to recover.