yeah lilian, see i think you've got an eating disorder and you're clearly obsessed with what you eat/what you weigh/what size you are.
well done for getting down to 10 stone in - what? - 3/4 months? see, you KNOW you can do it, there's no need to be so obsessed anymore. chill out. i'm not saying completely let yourself go and eat yourself to death lol, keep counting them if it makes you feel comfortable, but be rational. if you can afford two treats a week, ENJOY THEM. that's what they're for, no?? don't feel guilty because then what's the point of eating them?
getting down to 8st8lbs is your ideal yeah? well then you've got less to lose. you're already about two thirds of the way there which is excellent. don't quit school, don't feel like **** and don't not enjoy your days because of this. you know you're losing weight the right way, you've proved that by losing over two stone, just keep going with the flow and relax.