hello @labazsisgoingmad, I have read your post very quickly but had to reply as its an awful story :( Your GP sounds very unsympathetic and unreasonable, and I am not trying to minimise obesity but I just don't think you are in surgery territory at all (imagine you are around size 22/24?)
You CAN lose weight healthfully without surgery, and one thing that you really have going for you is that you are REALISTIC to say, a 14/16 would do you. Some of us are just 'naturally' a bit bigger, and a bit hungrier! Speaking for myself I cycle from size 14 (which I am happy with) to 18 (which I don't like) and I'm not worried about heart attacks etc as when my weight goes up I tackle it quickly
I think Slimfast etc will leave you starving. I would suggest you look into 'ways of eating' that work with your body, & your hunger... so finding ways to fill up on fewer calories, which will help you lose weight. So eating lots of veg, lots of water (soup as well as drinking water), watching portions on high cal items (carbs), minimising sugar, eating the right amount of protein/fat to keep you satisfied
Try googling 'volumetrics diet' to explain some of these ideas, or look into 'nutritarian diet' (that is vegan, and you might not want to do that but implement some of the ideas).
My whole family are 'hungry' people and eat a lot: my sister has had enormous success with slimming world, and gets to eat a lot but has lost 4 stone to get to a healthy weight
There are other options vs surgery or fake food, and lots of support on this board x