ok, I'm going to pull a "when i was your age"
because we are exactly the same size.

WHEN I WAS YOUR AGE, I NEVER counted calories. I ate when I was hungry. I had no idea how many calories my meals were. You are way way too concerned about what people are saying to you. You could stand to gain 10 pounds and you will STILL get comments about how toned you are because you ARE TONED.

If your hair is falling out, your body is saying, I have to make a choice between LIVING and holding on to this hair. That is malnutrition. SO EAT and quit fussing about it. And yes, if simple common sense isn't enough, I agree, you need to see a counselor.