What an interesting thread, thank you Flaxseed. I feel for you. Surgery sounds very drastic, I know of one or two people who have gone that route but in one case it was a medical emergency and in the other - well, she went back to eating habits that led to the op in the first place and it failed. In both cases it had permanent life-changing effects, you are brave for even considering it!
My body shape changed permanently after a CS but I never had a problem with weight until middle age, perimenopause and a non-functioning Thyroid arrived, which took years to diagnose and treat, by which time I had gone from size 10 & 9 st to over 16 st & size 22. Demoralized doesn't even come close to how I felt and I still find it hard to look at photos of my children's graduation and my moon face. I got a chunk of weight off eventually but always knew I was still too heavy. My joints told me. Then other health problems have followed which add to it all.
However, it's not all doom and gloom! It has taken 15 years of research and trying out lots of different approaches but what seems to work for me now is TRE (time restricted eating) and careful choice of nutrients. TRE is a bit of a cheat for me as I never liked breakfast first thing and I was delighted to be off the hook! Now I have lunch at some point and dinner about 4 hours later. I enjoy green tea and matcha which help too. Oh and yes, like others, I weigh every day.
To keep me on track at the moment I subscribe to The Fast 800; I lost 2 1/2 stone over 3 months using their approach despite being unable to exercise and it works so well (caveat: it must be suitable for you). I need to have the reassurance that it's safe and not a fad. Wonderful professional support and easy to transition back to eating more and maintain using the 5:2 mediterranean style. When I've learned the ropes I will just carry on. Best of luck.