How effective is the rny gastric bypass surgery?

Depends on behavior: A roux-en-y gastric bypass can be quite effective in weight loss if it is part of a multi-modality treatment process. This can include support, diet, exercise, as well as the surgery. Your doctor can guide you in finding a qualified bariatric program, but you must be willing to accept that such a procedure is not the end, and you will have to actively participate in your recovery. Good luck.