Do you not think that worry is a form of concern? As I said, freaking out with worry is not healthy, but I see no problem with a little worry. A little worry may keep someone from making a critical life error.
Not to step in 6th Gen's place, but we're drawing a line between concern and anxiety. I think that she's getting at being "anxious for nothing..." It's the difference outlined in the Serenity Prayer:
God grant me the serenity
to accept the things I cannot change;
courage to change the things I can;
and wisdom to know the difference.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
Taking, as He did, this sinful world
as it is, not as I would have it;
Trusting that He will make all things right
if I surrender to His Will;
That I may be reasonably happy in this life
and supremely happy with Him
Forever in the next.
Amen.