Here's a beautiful prayer I found today:

O Lady of Mental Peace,
Mother of tranquility and
Mother of hope, Look upon me
in this time of my weakness and unrest.

Teach my searching heart to
know that God's love for me
is unchanging and unchangeable; and that
true human love can only being and grow
by touching His love.

Let your gentle peace- which this world
cannot give- be always with me. And,
help me to bring this same peace into
the lives of others.
Our Lady of mental peace, pray for me!
Amen