Want to loss my weight

I am a fat guy with 220 pounds. Now I am trying to control myself. I talk to a doctor and he suggests me to follow some instructions. I am trying to follow them but sometime I could not. I think 220 pounds is so much weight and I am afraid of some disease like high pressure, heart attack, diabetes etc. So i am thinking about the insurance. I am German citizen and got some information from this site. Looking for more information.