I'm sorry you're feeling anxious. Sometimes it is a mystery where it comes from isn't it?
Maybe some relaxation techniques would help? There is a free guided imagery at this site that you can do right at your computer. It is very beautiful and relaxing. It says it is 20 minutes, but honestly those 20 minutes go so fast while you are relaxing through the guided imagery. It's fun too. Here's the site:
www.meditainment.com and the guided imagery is called Secret Garden. I love it and hope you will too.