Must it be a permanent solution??? There are some semi-temporary solutions that you could consider that will give you the same results without putting your health at risk...Like the Lap-Band.
They fit a sort of doughnut around the upper part of your stomach through keyhole surgery. It is much less invasive (usually) than the other surgeries.
Once recovered they inject the doughnut with liquid to inflate it and effectively cut off a percentage of the passage between the upper and lower parts of your stomach. It turns your stomach into a sort of hourglass with a much smaller top section (holds about a juice glass worth of food at a time)...the food must be well chewed and eaten in very small quantities, takes a long time to go through to the other side...reduces your sense of hunger (you get full with 3 bites) and the weight loss is dramatic without all of the dangers.
Most of the women in my 'French Family' over here have had it done, about 6 of them,...with incredible results...it can be loosened or tightened, by the surgeon, over time and gives pretty much the same results without actually cutting out a piece of your stomach or shunting it.
You can keep it in place from 10-15 yrs (here the recommendation is to change it after 10yrs but it is not obligatory).
That said, my 'Little Sister' had the lap band for 10 yrs with great success although she did have it loosened a couple of times and put the weight back on, once they re-tightened it, the weight slipped back off.
For some strange reason, about 8 yrs ago, she got it into her head to have it removed...no problems with it, she just decided that she 'should'...well, about 100lbs came back in a flash...so, she shopped around and decided to do the bypass...I begged her not to, suggested that she return to the lap-band which had worked wonderfully or at least aim for the sleeve,...She is perfectly healthy other than the eating disorder...
She refused, went for the bypass...obviously someone who has never had constant diarrhea or digestive problems was as horrified by the results, running to the bathroom 25-40xs/Day in the beginning...now she manages it but considers herself permanently handicapped and has not worked since. Tells me that I cannot understand what it means to be handicapped...she hates her life now.
I am not a doctor nor a psychologist but maybe the lap band compromise could be acceptable to you?
My only advice is to never do anything that could seriously compromise your health and leave you worse off than you are today.