It’s not over yet. Amid lingering concerns about higher interest rates and rising inflation, the Dow Jones sank into correction territory today, dipping down more than 1,000 points — or 4.3 percent. The development is the latest twist in a dizzying week for Wall Street, as new market volatility has shattered the relative calm of recent years. “There’s no telling whether it’s going to be over in a few days or a few weeks,” one trader said, though few seem worried. The NASDAQ and S&P 500 also closed down by nearly 4 percent.