Weight loss surgery
It is my understanding that Mississippi does not cover bariatric surgery under Medicaid currently. I'd contact them to confirm for sure but that is my understanding... you might post this again on the OH Mississippi Forum perhaps some local people will reply.
When you say you have tried everything else do you mean weight loss methods? There is a lot out there but not all are evidence based, lots of fads and crap. Let me link you to this guide too: http://www.obesityaction.org/obesity-treatments
Best wishes to you.