460 calories a day

Hi i am an 18 year old girl roughly 5ft10 to 5ft11 and my bmi is within normal range. I really hate my body but i've never really had any problems with eating in the past except becoming ectreemly intolerrent to nuts over night lol
Recently i have become very obsessed with calories and its never bothered me before. I am currently consuming on average 460 calories a day. I know this is bad and i know the risks so i don't know why i am doing this !!!
I can't eat anything unless i have measured it out on scales first. like today i ate ready break and it said one serving 30g but it came to 32 and i HAD to take off the extra and finally settled on 28g. I had a glass of milk but i measured it in a jug so that i new exactly how much calories i had. I am currently exercising quite a lot and i am at uni all day and then going up to the stables and riding in the evening. I know that this is bad but it makes me feel so good and happy. This literally happend over night and has only been going on for about a week. I am rapidly loosing weight already but i heard that this is water weight which will return pluss more. I am drinking a normal amount of water yet my throat feels constantly dry. Before this my weight has been very steady. I am getting really irritable around people eating and feel angry yet i am not really craving food. I know this is very early but i already feel like i am getting sucked into it. How much longer will this sustain me ?

[Rach878]

I have to tell you that what your doing is very dangerous. I am 19, and have and am struggling with bulimia and anorexica for the past 7 years. you are headed down a very dangerous, tiring, and lonely road. I know that you feel fine know, but you won't in amatter of just a few more weeks. your hair will fall out, your teeth will rot, your organs will stop working, you'll lose a large portion of your friends. Eatign disorders are not fun, and are a serious problem.
Keep drinking a lot of water, and get ride of the scales you use to measure your food. Also eat more than 460 calories.  This is very serious. Although i have had an eating disorder for many years and haven't seen a ton of serious side effects i do know they might hit me when i'm older, some girls experience seriuos side effects right away. I new one  girl who had a heat attack and died within a few months of starting her eating disorder.
Tell someone adn get help ASAP