I have had an eating disorder for 10 years. First I was bulimic, then anorexic, and now I am diagnosed as EDNOS because I am doing well in recovery. I have lived in many treatment centers since 2006, with some treatment before that.
In my experience with being in treatment, I have learned that my anxiety is the biggest cause of my eating disorder. With that said, I have also learned that not eating enough will cause more anxiety about food and everything else.
How old are you? I do not think you are eating enough. I have extensive knowledge about proper nutrition from seeing so many dietitians over the years, and I know that women need at least 1800 calories a day in order to maintain body weight...a little less than that if you are short.
Consuming 1200 calories a day restricts your body of necessary calories to function. Most women's basal metabolic rate (BMR, which means the amount of calories your body burns when you are basically a human vegetable), is between 1400-1600 calories. That means that you need to consume MORE calories than that minimum in order to perform daily functions such as walking, brushing your teeth, or even sitting.
Furthermore, as I said before, restricting your calories increases your anxiety and makes you more fearful of food. There was a study done post-WWII to study the effects of malnutrition on the brain and body. Many men were studied and told to eat only half the amount of calories of what they are supposed to consume per day. This was done over a course of several weeks. By the end of the study, many men had developed an eating disorder or at least a severe obsession with food. None of these men had had eating disorders in the past. They developed a fear of food and some men became bulimic. If they were only obsessed about food, they would constantly talk to one another about food and look at cookbooks. In conclusion, malnutrition has a direct link to the symptoms of an eating disorder.
The study is called "The Minnesota Starvation Experiment" by Ancel Keys. You can read a summary of it here:http://www.eatingdisordersreview.com/nl/nl_edt_7_3_2.html
You can also google it to learn even more about it.
I have experienced the severe effects of an eating disorder first hand and I am also majoring in Psychology, so I have extensive knowledge about this subject. Trust me, you need to eat more...please heed my advice.
I hope this helped!