I'm not for using braces, but I can understand why people like them.

Just take it easy. The doctor OKed it. Do a short, gentle run, and stretch/ice it when you get home. You're an overpronator, right? You got custom orthodic, if I'm not mistaken. Did your PT give you exercises to strengthen your ankles?

Rule of thumb---listen to your body. If you start running and it hurts, stop right away. Good luck.