the thing is this. In moments of high fear and greed the stock market becomes a meter of investor's minds. Toss out discounted cash flow, earnings predictions, etc. It's just a meter of mob hysteria. Since humans are very very social critters, we tend to all think the same thing at the same time. So thousands or more people felt the same panic you felt, at exactly the same moment and sold hard.
The only cure to this is to consume less or zero business news. The more you read and hear stock market news the worse your returns will be. Watching a stock tick by tick is very bad for your stomach. And investors need a strong stomach.
Your social nature makes you extremely receptive to news that inspire greed and fear, and it happens the same time as everyone else at extreme moments of fear.