JANESVILLE, Wis.-- ... In this city, the loss of the 90-year-old G.M. plant and its 2,500 jobs has created a swirling mixture of anger, confusion, worry and hurt, underscoring how the recession is raising anxiety among workers nationwide. Combined with the shuttering of several nearby suppliers, the G.M. closing meant a loss of 4,000 jobs in this city of 64,000. Their union contract has given these workers more relief than many. With few local employers hiring, more than 1,000 of those laid off have returned to school, seeking to reboot their lives by studying welding, nursing, cooking and other fields, thanks, in part, to the contract's tuition assistance.