boarder line eating disorder

hey so i’m a college student and i used to be a pro swimmer all through high school so i would normally eat a TON. i’m super happy with how my body looks and i don’t judge myself but ever since i’ve moved to college i don’t know what’s wrong. i will go through spells of not having any appetite at all for days and literally eat one meal in 3-4 days because i just can’t eat. then when i all of a sudden get hungry it’s really hard for me to eat. like today i got a bowl at chipotle which i would normally scarf down in minutes but i could barely eat 1/4 of it. i’m just super confused because i love the way my body looks i just don’t know why i can’t eat anymore