Great post; acknowledging you're not happy with a situation and writing it down and sharing it is a step up!
Next step - try to speak to your gp and get professional help. Hard I know at the moment but it does seem that the psychology part needs expert help. Drastic gastric surgery won't help address what's going on in your mind.
Here's what helped me - declutter the cupboards, freezer and fridge of the high sugar stuff. If it's there, it'll get eaten.
Write shopping lists - and stick to them. Helps move away from impulse buying.
Avoid the supermarket aisles packed with biscuits, chocolates, ice cream, cakes ... I just don't go down them, so I can't see it.
Instead of beating yourself up, write down your goals and hopes - some new clothes, being able to enjoy a long walk, running about with family in the park. Nice things.
And I really like @whatlauraloves on Instagram, she's a lovely body positive vlogger with lots about fashion, beauty, pampering, hair, makeup, home ... she's fab.
All the best! X