Well done for having lost a significant amount of weight in the first place. You, along with 95% of other dieters, put it back on plus a bit extra, unfortunately. Over what time period did the 19kg weight gain happen?
It can be easier to lose weight when you're younger: you're usually more active and can easily have a higher energy expenditure than an older, more sedentary person. Use this to your advantage. You already know how to lose weight: you've clearly done it very successfully before. I'd recommend that as long as it wasn't some sort of deranged dieting, you do again what you've proved to work already. However, this time, you need to examine what is was about getting stressed that threw you off the diet in the first place, and then completely once Christmas came around. Stresses and issues will doubtless arise again during this weight loss, and you need to sort of pre-empt them by thinking about coping strategies that
don't involve turning to food, so you can live your life and not only continue to lose weight, but keep that weight off, which is the hardest part.
Your paragraph about sugar was a bit troubling, as was the idea of 'not having any 'unhealthy food' in the house. It's a bit 'all or nothing' thinking, which would fit in with the binge eating issue. It's usually more helpful, and more sustainable, not to think of food in terms of 'good' and 'bad'.
All food is OK - it's just how much of it we eat, and the overall balance. Obviously you need to restrict your energy intake if you want to lose weight, and restricting 'empty calories' like high fat, high sugar treats is the easy and most obvious place to start, but don't get into the mindset that you can't
ever have chocolate or ice-cream or confectionary once in a while as a treat. As well as probably stopping the bingeing at the weekend on these things (you're bingeing on them because you're denying yourself them during the week, and creating an irresistible 'wave' of desire for them), it's a much more realistic, healthy way of going about things.
You're changing the way you eat
permanently, not just during the time you're on a 'diet'. Develop healthier ways of thinking about food and make lots of small, permanent changes which are practical and that you can live with, taking into account your individual preferences and likes for food. You'll succeed, doubtless