Mantra can help you stay positive when things appear to be falling apart around you. This video by Harijiwan dispels some of the concerns that people may have about using mantra and includes a short talk by Yogi Bhajan on practicing mantras.
The mantra he mentions ( "Ek Ong Kar Sat Gur Prasad") is designed for the Aquarian Age, and chanting this mantra will amplify the mind. It can help you manifest your positive thoughts or negative ones. But don't worry - the negative current is there to remind us of the positive current, so if you find yourself becoming negative just get back to the positive!