Save my life- weight loss surgery

I am a 44 yr old tired women, wife, mother of 6 kids, and full time special education teacher of kids with severe disabilities.  I have struggled severely with weight for the past 20 yrs.  I have tried and tried countless diets (weight watchers, HCG shots, Medifast, weight loss classes, personal trainer,  hypnotherapy, medications, South Beach, Atkins, The Zone) with each effort came some weight loss but it was not sustainable and even caused more weight gain.  I can give many valid excuses for why I have had a hard time losing weight- age, genetics, depression, working 80hrs a week, my kids and busy schedule...but overall I feel so hopeless.  With over 130lbs to lose I have no hope.  I hurt all the time.  Simple things like putting on my shoes, going up the stairs, getting into my car, chasing kids around my home and school, are virtually impossible.  I used to dream about being on Biggest Loser or getting a tape worm from Mexico (so NOT healthy).  I have been looking into weight loss surgery but my insurance does not cover it.  I just had a physical with my Dr. and things don't look good.  High blood pressure, high cholesterol, sleep apnea, and deteriorating liver function.  Why will my insurance not save me?  Why is surgery not covered?  I feel like surgery can save my life and add years to my life.  I want to live for me and my family.  I am discouraged.  This is my last attempt to try and get some help for surgery.  The cost of surgery is $20,000 through BMI Utah, I am wanting to get the DS loop surgery.  It has the most sustainable weight loss.  Here is the link to their site.  http://www.bmiut.com/duodenal-switch-surgery/ 

Also, here is a link to my blog that I started when I did my latest weight loss attempt in March 2014.  It's depressing.  I lost 70 lbs in about 7 months and now 2 years later have gained it all back plus 20 lbs.  :(  But you can read more about me and get to know me and my history a bit.  I really liked Medifast and it worked as long as you have $350/month and you eat their food. 

http://sallysincrediblejourney.blogspot.com/2014/03/beginning.html
This means so much to me because I feel like it will SAVE my life and GIVE me my life back.  I want to be myself again.  I feel trapped.  I'm sick of feeling sick all the time and being a second class citizen.  I am tired emotionally and physically.  I want to have energy for my kids at home and my kids at school.  I want to live a long time and be part of my kids' lives and grandkids' lives.

Please help if you feel inclined.  I know there are a lot of needs in this world so I thank you for taking time to read mine.