Yo yo I get it - totally. I started at 12stone. Down to 8st 13 in November 2014. 7 weeks later 1 stone weight gain. Yes, Christmas, new year, an unbelievable amount of partying, 2 holidays but all excuses. There is no justification for putting that kind of weight on in 6 weeks at 9stone.
I felt like things were slipping out of my control. Wore my skinny jeans on the way home on a Sunday night and when I got in my skin was almost raw from how tight they were. I was so upset and needed drastic action. First thing I did was got on the scales, could not believe I'd put on a stone.
So my nemesis, sugar, I decided to cut out completely in January. I lasted 3 weeks and lost 5lbs. Felt amazingly better.
Feb I was in Hong Kong on business for 2 weeks and gained a pound.
March I'm hoping to go back to losing ways again and am totally in zone at moment.
The point is, you sound like you've had the shock to the system you needed (the jeans, like me). Now in my view you need to go cold turkey for a couple of days to get yourself back on track. If you're anything like me, weight loss on the scales makes you want to lose more - it Spurs you on. I would cut out all the crap for 48 hours, eat lovely clean healthy food and see how you feel at the end of it. That's how I always get myself back on track. And 2 days isn't so aggressive that you rebel against it.
You've not let this slip away yet, you're still in control, you just need that little jolt to get you back on the straight and narrow.
I'll check on you tomo xx