Surgery just around the corner, hope you get that surgery out of the way. I would not imagine that a cold sore would postpone the surgery, but then again, who knows.
As long as you are not running a fever...
I personally gob on the CARMEX morning noon and night, before I go to bed. I'm sure you're extra anxious.
Try some relaxing/sleeping if at all possible. Calm CD music is my best friend, with headphones.
See you on the other side. It'll work out.