Blimey Mammy, I have been pondering making this exact post myself! 
I too think it's psychological and think I should seek some kind of CBT - I've had it for a phobia and it was rather good.
Like you, my eating isn't necessarily emotional, or to soothe upset/boredom/frustration etc, and it has nothing to do with ignorance of how to eat properly. I eat cake and chocolate because I love it, it's a habit, and it makes me happy when planning to eat it, in the lead up to eating it, and while I'm eating it. It's like a FWB you really really look forward to seeing, and you can't give them up no matter how toxic.
Except of course, afterwards you feel bloated and ill and ugly and wonder why you keep doing it. And then you feel bad about yourself, so you move back towards your old friend again to forget about it all for a while.
I have broken the habit several times before, and lost 3 stone on several occasions. But eventually, the pull of my old friend and mindless abandon wins out in the end and I remain 4 stone overweight. I wish I knew what to do, willpower just isn't enough is it?
Well done Chicken and others who have beaten this!