I think most girls hate their self image, you just have to accept your natural body shape. I still have my odd day where I hate my body, at the moment I do >_>; But in the end it's media and most men's fault of women's self concious of their bodies.

It does sound like you are suffering from anorexia and bulimia. If you say you weigh 5 stone, you need to put on some weight, depending on your height, unless you're like 4 foot or something small like that, it isn't normal. Force feeding isn't going to help you put on weight, its probably a bad solution, I used to be force fed, to the extent I would refuse eating at all.

You just have to try and eat small meals and gradually build up your weight, eat like a low fat breakfast sort of like Weetabix and skimmed milk, or special K cereal (it taste lovely <3), snacks eat like fruits/ vegetables or crackers and eat whatever you are given for dinner, just ask your parent's if you can have a smaller portion, not something ridiculous like one pea or something, a full meal. Drink lots of water, water does help burn off some calories, also drinking herbal teas helps boost the metabolism, and if you can handle it, black coffee without sugar.

I'm basically giving you advice to gain weight, its up to you to deal with your poor body image, but being anorexic isn't a nice thing, and means that you can not enjoy the pleasures of foods you like without thinking that its gonna make you fat. And a fact which I read somewhere, something like you body uses up 60% of the calories you intake without the need of excersize and stuff. Don't hold me to that but it's a statistic like that or something.