After loss, I wouldn't keep investing mindlessly. I would first take time to review what has happened and how I have contributed to it knowingly and unknowingly. I would then proceed to investing more intelligently.
It is very comon in trading that wnen a person lose a big amont of money, first he remain as senseless and always thinking about his lost money, but expeirenced trader always find the way now to recover thier lost money and for that they make new strategy and planning which can enable them to recofer their lost they have made in trading.