Please Help...Horrible Color

Okay, we leave for vacation on Tuesday.  My hair stylist is closed on Mondays.  Last night, I colored my hair.  I am a natural brunette with a good bit of auburn in my hair.  I don't know what happened but now my hair is orange-ish.  I just wanted to get rid of the gray that was coming through, but I have made a big mistake.  There is no time to get to a salon.  So, what I can possibly do?