You have to save yourself. You're the only one who will care enough, and go through the effort to make the changes you need to make. Tell yourself that you're going to do what it takes to get healthy.
Tell yourself, "I've eaten enough now, I'm full. I don't need so much food."
Tell yourself, "I have to get up and be active today."
Tell yourself, "I can do this with God's help."
Believe it. And enjoy your own personal rescue, day-by-day.