Hey Champ, welcome and congrats on Day 12. Your post really resonated with me, because apart from the kids, that's me, right down to the 25 kg overweight! I'm 48 and have struggled like you. For the anxiety in early sobriety (for me anyway) some sort of physical activity helped. I wouldn't advise running, but maybe a vigorous walk (unless you're in the US, Europe and snowbound), or gymwork, even some bodyweight stuff, like pushups, on your knees to start if you have to. I found this video pretty inspirational for someone overweight like me.
https://www.youtube.com/watch?v=qX9FSZJu448