Gaining weight after anorexia?

I am 5'4 and 95 lbs. When I began to suffer from anorexia nervosa, I was 5'5 and about 102 pounds. My lowest weight ever was around 93 lbs.

I have been eating normally for about one year. I had a relapse in December, but it wasn't too major. (It is May now)

I got back up around 100 lbs before that relapse and then I got down to 95. I have stayed there despite my best efforts to gain weight.

I'm always picked on for being too skinny and I'm tired of it. Why can't I gain weight?
Gaining weight after anorexia?
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