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).
The humble ginger herb is another great way to reduce symptoms of pain and anxiety, and is a great Lyrica alternative. To use this treatment, all you need to do is find some Ginger tea, stocked in almost every good supermarket, and brew yourself at least two cups a day. This is best taken at morning and at night.