If anemia (1 1/2 years) is the cause of enlarged heart and anemia is corrected will heart most likely return to normal?

Yes. Why do you ask? Talk about "dangers of an enlarged heart" is mostly sub science. Apart from a few uncommon illnesses in which the heart is big secondary to abnormal shape, big is not dangerous. When I am in athletic training, my own heart becomes noticeably larger and i welcome this.