Practising mindfulness daily can literally change your brain.
With each mindful activity or meditation that you practice you are re-wiring your neuro pathways. Neurons that wire together, fire together. This is true for both negative and positive experiences.
Practising mindfulness moves one into the optimal range of their nervous system, therefore, calming their nervous system. When our nervous system is calm our brain is working well. We are able to make good decisions, accept pain, grief, loss as well as become comfortable with the present moment.
Here are some free mindfulness meditation sites: