"A psychologist says that we learn anxiety as children.
Since what we worry about rarely comes to pass,
children sometimes think that their worry prevents undesirable events.
This is then reinforced when they forget to worry and something bad does happen.
As adults, while we may be consciously unaware of it, some of us really do think that worry helps.
The good thing is that if anxiety can be learned,
it can be unlearned.
Many of us chronic worriers have a God complex.
We think that without our efforts, nothing will get done, or done correctly.
We worry about everything because everything is our responsibility.
Wrong. Only God is omni-responsible."
From - http://www.bestyears.com/anxiety.html
And God is trustworthy.
Do not be anxious about anything,
but in everything, by prayer and petition,
with thanksgiving,
present your requests to God. Philippians 4:6