As I've been thinking about this whole issue of fear, a pastor at a church I visited yesterday talked about it in his sermon. I rarely take notes in church, but I was writing like a mad woman yesterday.
In actuality, his focus was on the difference between happiness and joy. Happiness is dependent on our circumstances, whereas joy is really a mindset and runs much deeper.
He said something which stuck with me, and that was:
The Opposite of Joy is Fear.
I lost my notes, OF COURSE, so I can't expound right now on all the points. But basically, if you can figure out what is robbing your joy, you'll banish fear, and find joy!