Pran Bandha Mantra means that mantra, or sound combination, that collects, binds, and commands the life force or prana. Pavan is the air, the breath, the carrier of prana, or the life force. This is God in action.
If you relax about the Unknown, 75% of your tension will go. Happiness comes from relaxation.
To be what you are is the essence of truth and will lead you to the nature of Reality.