Do i have an eating disorder?

i'm 5'6 and i weigh 114 lbs; i used to weigh 127 about a month ago. food is always taking over my thoughts and emotions, i count calories all the time and i measure all my portions. i avoid being around friends/family when they're eating so i'm not tempted to eat more. i black out whenever i stand up and i feel weak all the time...i don't want to really lose much more weight, but i'm not sure if its possible not to with the way i eat. i eat 750 calories at most per day, when i should be getting 1,500. what do you think? thank you!