I woke up this morning with a cold sore

mind you the last time i got one was almost 8 years ago in highschool.. I have 6 days till my wedding and my worst nighmare has come true.. I am devastated.. I cant imagine having to greet all my guest and what my pictures will look like with this stupid thing on my lip.. If anyone has any tipe to help it heal I would appreciate it. Yes I called my doctor but she just told me the usual.. TIA I really need a miracle!!!