NEW YORK - Wall Street suffered through another extraordinary and traumatic session Monday, with the Dow Jones industrials plunging as much as 800 points - their largest one-day point drop - before recovering to close with a loss of 370. The catalyst for the selling, which also took the Dow below 10,000 for the first time in four years, was investors' growing despair that the spreading credit crisis will take a heavy toll around the world.