I’m currently doing a research on anorexia nervosa. Please enlighten me about this, thank you

I hardly eat anything anymore and I feel kinda guilty when I do eat. I tend to starve myself, even though people say I look fine. I kinda try to count the few calories I eat and when I do I find myself on the floor doing crunches and leg lifts to burn them off. Might I have anorexia nervosa?
I do have really low self confidence. I suppose it all started when I fell in love with a guy who fell for one of my closest friends. I am about 5 feet 5 inches, and I’m not exactly sure about weight.
Also, my grandma, who doesn’t know that I starve myself, mentioned I am starting to get bald spots.

From a psychological standpoint, can someone explain some of the health problems associated with anorexia nervosa, bulimia nervosa, and binge-eating disorder?

Does constant overeating count as an eating disorder? what do you call it if one overeats on purpose? What if it’s NOT on purpose.. if they feel SO hungry all the time that they eat and eat and eat until they throw up because they NEVER feel full, but it’s a mental thing, not a lack of physical fullness?

What eating disorders exist besides anorexia nervosa, bulemia nervosa, and PICA?

I know the death rate of anorexia nervosa is 15% after twenty years, but what is the mortality rate for bulimia nervosa?