this is in response to the period comments.
When I went to boot camp the RDC's (people in charge) told us women that some of us wouldn't have periods the entire time at boot camp due to stress levels and whatnot, as well as due to weightloss.
I lost an incredible amount of weight in a short time, went below 100 pounds, and was eating like a horse. My typical weight when I run 5-9 miles daily and eat normal is about 110-115, so this was not due to physical activity.
In boot camp, regardless of my weight, I had my period. But I think in my entire life the only time I missed a period was when I was pregnant. X_X
From what I've read, working out excessively, changing eating habits, etc, are bigger causes to not having periods than body weight itself. It's typically based on the stresses being put on the body moreso than anything else. Anything less than a 1000 calorie diet may trigger periods to be *nonexistant*
a healthy diet would consist of at least 1000-1500 in calories. If you are not asian (this is not a hit on anyone, their bone structures are much smaller and they actually are healthy and have periods at insanely low weights), your bone structure may be too large for your weight to be "normal" at 85-95 pounds.
for 5 feet tall, you should be between 100-105, so trying to work on being 103 is right on target. When you get to that point, just work out a caloric intake that keeps you steady at that weight, and maybe see someone regarding the ED.
Good luck ^_^