Could I be developing an eating disorder?

[maeko]

I honestly don't know if I am. It all started last year; I was a bit overweight and wanted to be healthy so i went on a diet. It was just a normal diet at first, not really undereating about 1000 cals a day. Then I started eating under 500 whenever was at school and skipping breakfast and lunch, I had dinner but as little as possible. I sometimes binged and then i felt really guilty and purged i only did this on average three times a month so my teeth didn't get ruined. I lost 2 stone I was 5 foot 6 and 7 stone 11 at y lowest weight. I started getting dizzy spells and lost my period for 7 months, i've only just got it back. I thought of food everyday, then i went to my grandma's for 2 weeks and couldn't bear hurting her so i ate 1800 calories a day. When i got back i started to eat again but it was kinda out of control because i think my body had lost so much nutrients and I put on a stone, i still felt fat ugly and guilty all the time though. I have really low self esteem and have recently started dieting again, i am 9 stone and just feel so fat, i am hoping to get down to 7 stone. I eat under 500 each day and constantly think about food and how i can avoid it. I lie to my parents by chucking away food and leaving dirty bowls around so nobody knows i haven't eaten, they thik i eat lunch and breakfast but i don't. I don't overexercise though i just hate it. At one point i wasdoing 100 situps a day but i don't do that now. I drink loads of water to make myself feel full and am constantly cold. I just hate my body so much. I get up an hour earlier than the rest of my family so that i can weigh myself in secret. I just can't stop thinking about food and how many calories i ate it's constantly on my mind. I have to eat more at the weekend around my parents like 1400 calories and i feel so guilty. I can only fast for 2 days at a time and hardly ever get to do that with people wanting to feed me. Doesn't the few months eating cancel out the idea of me having an eating disorder and if i have one then why am i so fat? I don't make myself throw up anymore like last year either. I feel in control though like i could stop if i wanted to, however i was going to go on a normal diet to lose weight but just can't help doing it this way. I went vegan to try and cut out calories and also for moral reasons. It would just hlp me so much if someone who has had an ED or knows about them could tell me if there's anythnig wrong with me.