Could you develop anemia in 2 mos from eating under 800 calories per day for that period of time (dr.-unsupervised)? hemoglobin was normal before this

Starvation: Yes. of course. If you are malnourished and a women who is having menstrual bleeding this should not come as a surprise. Starvation diets are the most dangerous and ineffective (in the long run) choice for dieting.

Anemia: yes, you can. Particularly if your iron levels are low or borderline low. You may also lack essential vitamins.

Possibly: If your diet is low in Iron, Vitamin B-6 orB-12 This could certainly occur.

Sure thing: Yes, if you don't eat a well balanced diet including Iron and vitamins you could become anemic from Folate (folic acid) deficiency, B12 deficiency and Iron deficiency, it all depends on your storage level of these prior to dieting that how quickly you become anemic. This kind of diet is not recommended and not wise, could cause malnutrition and also backfires with Carb craving and also not sustainable.