Everyone's always asking, "What are you worried about?" and "What keeps you up at night?" Instead of constantly worrying about what could go wrong in the stock market, start thinking about everything that's going right, Jim Cramer told his Mad Money viewers Wednesday. Cramer said the economy will continue to grow after grinding to a halt in the fourth quarter. Speaking of the fourth quarter, Cramer said Federal Reserve chairman Jay Powell's change of heart is another positive in the market.