Hey @thecutback it sounds as though you have had a spectacularly hellish year, so go a bit gentle on yourself 
That said, it also sounds as though you’ve had one of those sudden moments of realisation, which can be super helpful when you need to regain control.
I had something similar about 18 months ago: I got on the scales and just felt that enough was enough. It wasn’t horrific, by any means (I’m 5’6” and was just under 11stone) but like you’ve I’ve always been around the 9/9.5 stone mark, and a size 19/small 12, when suddenly (ok, not suddenly, it was slow but constant gains....) nothing fit and I was wearing the same stretchy, more forgiving clothes all the time.
I had two options: accept it, or lose it. Thank goodness for the amazing support on the weight loss threads...I’m a big fan of 5:2, but had fallen off the wagon over the last 5 years, and got great advice and support as I slowly regained control and lost the weight. I also joined the gym, and started enjoying getting properly fit for the first time in my entire life.
There’s no miracle cure but 9 months after I started I was back to 9.7, but fitter and stronger than I had ever been. And nearly a year later I’m still at 9.7, and still working out regularly, and proud of myself for making the change.
You can do this. One day at a time. Some days won’t go so well, but stick at it, and you will get there.