The stock market may have had a massive rebound on Wednesday, but the recent slump has plenty of Long Islanders worried about how recent losses could impact their retirement funds and investments.

After what's being called the worst Christmas Eve trading session in U.S. history, the Dow Jones industrial average was up more than 1,000 points at the close of trading Wednesday. It marked the largest daily percentage gain for the market since March 2009.

Experts point to the partial government shutdown, the treasury secretary's concerns over the health of banks and the possibility of President Donald Trump replacing the Federal Reserve chairman as key factors that upset the market on Monday.

Michael Kresh, a certified financial planner, advises people not to panic, as that often leads to rash decisions, especially when it comes to retirement funding.

But Olgaliza Flores, of Central Islip, says focusing on the long term isn't easy and that she fears there won't be any funds left by the time she's ready to retire.

Kresh says it's important to do your research before making any moves.

"You do not want to leave the market," he says. "You should not sell now because we'll never know when the market recovers, and it has always done that. So, the best thing to do is to think about how you need your cash flow."