I too have been where you are @goingpearshaped and echo what other posters have said about how important it is to let go of those feelings of guilt and self-loathing.
I had a major breakthrough a few years ago when I realised that I wasn’t fat because of some fundamental moral failing on my part. I was fat because I had a lot of shit to deal with and eating was simply my way of dealing with that. People don’t feel like a failure for having a glass of wine every night to cope with things, so why would I need to feel like a failure for eating a chocolate bar? 🤷🏻♀️
I successfully lost 4 stone last year. I started , not by looking at calories, but by going to bed earlier and making sure I got enough sleep. Then I looked at ways of managing my stress better. After that, I added in some moderate exercise, and a few weeks later I started removing some of the rubbish from my diet.
I did move on to counting calories eventually, but I don’t think I would have stuck with that if I hadn’t put those more fundamental building blocks of more sleep, better coping mechanisms for stress and a little bit more movement in place first. I still have days, or weeks when I’m not doing so well diet wise, but I try not to beat myself it over it. As long as I’m still doing at least some of the other stuff, I’m doing better than I used to do!
On a different note, I also read that Why We Eat book. A lot of people really like it, but personally I felt it didn’t say enough about the emotional side of eating, which is such an important factor in many people’s weight gain. There’s not much point looking at the ratio of omega 3 and omega 6 in your diet, if you know that the first thing you’ll do when you get stressed is reach for a Mars bar. That’s just my opinion though 🙈