Whats wrong with me

My period stopped and i keep fainting ( fainted twice this week and both times I had hit my head) .

A guy at the hopsital the other day suggested I have an eating disorder, but I dont see that I am skinny enough to be considered anorexic. How much do you have to weigh to lose your period?

I dont know what to do or what to think?

I do eat but like maybe one meal a day if that, I walk on the average 2 miles a day( somedays more), I do have a fear of gaining weight or becoming fat because of my mother and my sister are all huge. I keep getting told you are going to look like that , just wait you will be obese. Everytime my hubby sees a fat person he points and laughs and then points at me. My own sister although she is 300 lbs tells me I eat to much, and points at my stretched skin from when I was pregnant. I guess maybe I have too much negative people around, I dont eat or cant eat in front of people, I eat in the kitchen standing up facing the wall,. I have only thrown up a few times but couldnt do it anymore so I stopped, but yet there are times I do throw up it seems unvoluntary , after I have aten. Like the other day I ate a few french fries and started to gag after I ate them.

I dont know what to do or what to think , I feel that it is normal to diet and keep fit to prevent from becoming fat and obese. Cause nobody wishes to be fat.

The skinnier I get the happier I get. I know can fit in a size 2 loose , I have to wear a belt , But I dont feel bone yet, alothough I feel a bit of bone in my butt when i sit , I figure I would have be boney to be considered anorexic.