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).
Use lemon balm. Lemon balm is an herb often used to reduce stress and anxiety, promote sleep, and improve appetite. It is also often combined with other calming, soothing herbs, such as valerian and chamomile to help increase relaxation.