When you first get your braces on, your teeth will hurt for a few days, as they will every time you get your braces tightened or your wires changed.
Chamomile is also popular for anxiety in children. Fennel. Fennel isn't for anxiety specifically, but it is linked to treating some of the most common symptoms of anxiety, including digestion, coughing (many with anxiety have a nervous cough), and asthma (anxiety can exacerbate asthma symptoms).
There are two great, natural treatments for anxiety-related stomach issues: Lemon balm has been used since the Middle Ages as a calming herb. Take 400 mgs twice daily to prevent your stomach from reacting to your worried thoughts, available in drugstores for about $4. You can also try iberogast, available in health food stores for around $20. Iberogast is a blend of plants and herbs, including caraway, chamomile, licorice, milk thistle and peppermint. Adding 20 drops to your water can sooth the receptors in your stomach when anxiety hits. Take an Integrative Approach to Worry: Focus on the Mind-Body Connection