Obesity is a complex and poorly understood issue. There are many metabolic, socioeconomic, mental/emotional, etc causes. I don't, for one second, think you 'did this to yourself'. I LOATHE that attitude that comes across any of the articles that just say "you did this" and it's "easily solved by exercising more and eating less" (usually by someone who has never had a proper weigh issue in their lives.). And that obese people are a drain on the NHS. No. This is wretched and perpetuated by the awful media.
Lots of love to you Albatross, because this is a brave undertaking and not one to take lightly.