I am 42, 18.5 stone and have a BMI of 40.5. 
I hate my body, have for years and years, I never wanted to be fat and forty, but here I am at 42 the biggest I have ever been.
Why if I am so very unhappy, do I sabotage my weight loss efforts and what can I do to help me motivate myself?
I am scared I am going to have a heart attack