By Adam Wilmoth Energy Editor awilmoth@oklahoman.comStocks swung wildly Monday, sending the Dow Jones industrial average plummeting by as much as 1,000 points before eventually settling down about 3.6 percent on the day. The broader market volatility combined with still-tumbling oil prices to drive 18 Oklahoma energy company stocks to new 52-week lows. “We haven’t seen much (stock market) volatility this year, but with the growing concern of China slowing down and world demand growth slowing down, it’s caused more volatility in the markets,” said Greg Womack, president of Womack Investment Advisers in Edmond.Read more on NewsOK.com