Dorothy Devine sent me the following piece from the Institute of Heart Math,
 

"Change your energy, change your life, change your world...

If we give ourselves unconditional self love for five minutes, the energy created strengthens the immune system for 6 hours.

When we choose anger for five minutes, this state diminishes the immune system for 6 hours.

It is a choice...."

There is also a great free wellbeing survey that gives an interesting take on your stress levels.