So, now that you know how to dress when stressed out, and you know how to simplify your make up, the next step it dealing with your hair.
My main wisdom for today: hats are your friend. Once you find one that flatters your hair and face (I'm rather partial to a beret), they can be used to add a little pizazz to your outfit, while hiding those slightly dodgy roots. The only problem with hats is that many places expect you to remove them.
Headbands are also very good for adding some fun to an outfit, all while keeping stray hairs in place. You can get them in practically any colour you can imagine, any style, and at any price. You can even make them ourself, with the help of a cheap store bought head band, some hot glue and something to glue one.