Failing miserably, don't know how to get out of this hole

[Failingatlifemiserably]

I'm about 3.5 stone overweight. I'm about 13.5 stone.
Every week I start off with good intentions. I do a big healthy food shop on a Saturday and plan most of my meals. I never eat breakfast as I can't stomach it, so usually start the day with a protein shake. Today I did so well... But then yet again, something shit happens at work and I just feel like crap and end up ordering a takeaway.. This happens several times a month.. I'm ashamed of it.
I exercise regularly also as I genuinely do enjoy exercise....however its doing nothing because I eat terribly. I over indulge then feel like utter shit and then promise myself I won't do it again. I'm so embarrassed of myself. I look like the Michelin man when I'm undressed.
How do I pull myself out of this rut and not use food to compensate having a crap day or to make me feel better.
I'd like to lose the weight gradually and healthily and more importantly for good, but I can't get out of these bad habits that have been going on for so long.

Sounds like you're almost doing intermittent fasting already and can tweak it - when do you last eat at night and what time do you have your protein shake the next day?

If you can go 16hrs, or minimum 14, that's a good start. If you can exercise towards the end of your fast you'll burn more calories than if you'd recently eaten. I accidentally discovered this when my usual exercise in a fast gets my bpm to 150 within a minute or two and stays there. When I did the same exercise an hour after eating I struggled to get above 116bpm.

Can you find a replacement for food when you feel stressed? Something relaxing that doesn't make you feel like shit and horribly guilty?

i'm with you OP - but recently my good intentions are not even evident in the morning!

I would look around locally and see if there are any groups you could join. Not slimming world but perhaps a smaller gym or join a class where you get more support. Then you may feel more motivated. Support is important