By Sruthi Shankar and Bansari Mayur Kamdar (Reuters) – European equities reversed early gains on Tuesday to extend their selloff for a sixth straight session on worries over aggressive U.S. interest rate hikes and a potential recession. The continent-wide STOXX 600 index declined 1.3% after sliding 2.4% to over three-month lows on Monday. Health care and industrial stocks led sectoral losses in Europe, while battered banks edged 1.1% higher. Wall Street’s benchmark S&P 500 index confirmed on Monday it was in a bear market, after shedding 20% since its record closing high, on growing fears that…