But no matter how overwhelming a market fluctuation may be, I also know that pulling my money out of the market is the worst thing I could do when my portfolio is trending downward. Of course, knowing that you should stay the course is a lot easier said than done. Here are some ways you can stay calm when the market is scary. Your volatility plan could be as simple as committing to your head-in-the-sand strategy for downturns. But selling your investments because of market volatility and scary headlines is using a permanent solution for a temporary problem.