Source: Blake Ellis / CNN Money New York – U.S. stocks ended a gut-wrenching session with huge gains — erasing a big chunk of the prior session's massive loss — after the Federal Reserve said it will keep interest rates exceptionally low until 2013. The Dow Jones industrial average (INDU) rallied 430 points, or 4%. The S&P 500 (SPX) added 53 points, or 5%; and the Nasdaq (COMP) gained 125 points, or 5%. Immediately following the Fed's statement, the major [...]