28 stone is 392lbs, correct? I recommend you start here:
To get to 392lbs, it means that you've had some long-term habits form that got you there, correct? I would recommend trying to start forming a new habit. You don't need to go down to 1000 calories, crash dieting does not work for most people in the long term (to give you an idea, I can lose at 1800 and I'm 127lbs).
So, what are the habits that you can change starting today?