@Roger Green I did have the DS, over 11 years ago. I was on course for gastric bypass (with a surgeon who doesn't do the DS, of course) and the more I learned about the post-op diet (3 meals/day, all nothing other than LEAN protein and maybe a veggie, no snacks, only beverages water and Crystal Lite type stuff) the more I knew that I would not be able to stick to that for the rest of my life. I felt that I would do well initially, but not long term. I also was concerned about not being able to take NSAIDs for the rest of my life. This is one of those times when you have to be totally honest with yourself. For me, I could have accepted some of the unpleasant side effects, but not a rest of your life that, for many people and certainly for me, is unsustainable.
You've already tried your best with diets. Like you, I would have disappeared altogether with all the weight I had lost if I hadn't regained it. The only thing the sleeve does to help you is make your stomach smaller - at least for awhile. They stretch out eventually no matter how narrow they start out. Docs are making them narrower than they did at first, but this just postpones the weight regain, not prevents it. And a really excessively narrow sleeve will cause problems of its own.
The surgeons you have seen don't do the DS. They aren't going to recommend it, they may even say negative things about it. Yes, the complication rate is higher than with just a sleeve. It has to be, it's a bigger operation. But it isn't excessively high, and in return, you get far better long term results. MO is a chronic disease, you need a treatment that lasts a lifetime, not just for a couple years. I would strongly recommend that you consult with a surgeon who actually does the DS before making your final decision.
I knew the risks going into surgery. I was so confident about my decision that I wasn't nervous at all, because no matter what happened, I knew I had made the best possible decision that I could make. After 11 years, and even with a somewhat rough recovery, I can honestly say I have not had one day of regret.