who is your insurance company? and i have heard that btc takes payments and that they will do the surgury for around 20,000 and take payments of like 100$ a month. also get a doctor to fight harder for you. i know they are out there.
Have you gone through all your appeals yet? Try www.obesitylaw.com. Also if you have a 401k you may be able to borrow against that. Also a home equity. Other than that i do not know of anything else out there.