Hair thinning after anorexia? (Photo)

A few years ago I had anorexia. It was then where I lost 3/4 of my hair. I gained my natural weight back about a year and a half ago, and my hair still hasn't grown back. I've tried a number of natural supplements and increased my fats over the last few months. I eat around 1500-2,000 calories a day which includes smoothies, rice bowls, natural pastas. I have recently tried eating a vegetarian diet/dairy free, which I'm not sure will harm my hair growth because of the lack of protein or not.