When anxiety is too strong it becomes a disorder. But this is something that almost everyone feels. Also it is inverslely proportional to how happy you are. Any anxiety that someone feels lessons their peace of mind, contentment and happiness. One good example of the opposite extreme was St Francis of Assisi. He had total trust in the future.

There is an anti-Christian movie that Christians promote called Brother Sun, Sister Moon. It is all about St Francis and how the Christian Church burned down his chuch. It is against the organized religion but promotes purity of heart. Some find it hard to understand since it is about feelings not ideas or beliefs. Here is a site on Anxiety and Panic. It has different natural approaches to helping it including things that anyone can benefit from who wants more peace of mind including foods that may help it.