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).
L-theanine, an amino acid found in black and green tea, has been shown to reduce stress responses without causing drowsiness, and there is some evidence that the herbs passionflower and lemon balm may be helpful for anxiety.