I drink too much too tbh. And I've also been single for a while (this isn't me hitting on you y0).
The 3-4kg you've put on in your weeks off won't all be fat. There's a good portion of it that will be water retention. You'll find at least a kg of it will slip off extremely quickly as you get back into things.
Sup girl?
I was up at 63/64 and was down to <62 within 3 days of eating well and exercising again this week. It really is a mental thing, when you are used to be very lean all the time you feel like a whale very quickly Pizza and whisky for the winter blues!