Life is a permanent flow: one has to let go the past and present in order to authorize freely the next event of one’s life to happen. If not, a damp will interrupt the flow, which is not a good thing from a sound and balanced living perspective.
One has to live a life which is intrinsically ever changing, and thus which is anxiety provoking.
The only thing that is permanent is one’s awareness of being present in the present moment, which by itself is a blessing one should be grateful for .
At that point meditation, wether by focusing on an action like breathing or walking or by observing with detachment the course of our thoughts and feelings created by our mind or by exercising compassion and loving kindness towards other sentient beings can be of some help.
By the way it has been demonstrated by neuro-scientists that meditation modifies the way the brain functions and even the size of some brain regions.
I read an article on this subject in the November 2014 edition of the journal Scientific American entitled Mind of the Meditator, authored by Mathieux Ricard a Buddhist Monk, Antoine Lutz a research scientist at the Frenh National Institute of Health and Medical Research and Richard J Davidson from the University of Wisconsin-Madison.
They conclude that
“even with the requisite cautions, research on meditation provides new insights into methods of mental training that have the potential to enhance human health and well-being”