Fast-5 Life

So I've been back on fast 5 for a couple of weeks now (after a successful weight loss stint in 2010), and I haven been IF every day for a bit over a week now. As I have around 50lbs to lose, I'm trying to incorporate low(er) carb into this new lifestyle, as well.

Last night I had a total carb binge. Basically everything I consumed last night was carb-laden. Today I am miserable - disappointed, somewhat defeated and ashamed, and very hungry.

I welcome any advice, and my question is this - because I ate so many carbs last night, I'm sure I bumped myself out of ketosis. How long will it take to restore my body to a fat-burning state and to rid itself of last night's damage?

Many thanks.