Why am I now always hungry?

Im recovering from anorexia also. Ive been working out and eating a lot. Im still trying to gain weight back. Ive been eating about 3000 calories a day because Im always STARVING and I don't know why either! Its like I cant help myself Im always looking for something to eat. I think maybe out metabolisms are just working harder since we are giving ourselves more food. My nutritionist says that its totally normal.