In Tibetan Buddhism, Malas are mainly used for counting mantras. The mantra is a word or sound repeated to aid concentration in meditation. Mantras can be recited for many different purposes designed to work with the mind.
Meditation, breathing exercises and mantras; are all very good ways to quiet our minds and create a relaxed environment. These methods are all excellent ways to battle anxiety. There are a number of free videos, music and mobile applications devoted to engaging the mind for anxiety relief.