not eating or being hungry but kinda repulsing the idea of eating is a disorder?

a friend of mine keeps pointing i may have an eating disorder because i can go a long time without eating (until i start to feel very weaky, shaky and as i'm about to faint) and sometimes i can't get myself to want to eat even if i'm hungry, cause thinking of food, chewing, swallowing, makes me feel nauseated and nervous, all the time i just wanna finish the meal... i'm not sure why i feel this way, maybe it's the anxiety i believe i have, anxious people have problem at eating... it's not because of my appearance, actually i'd like to gain some weight, but i never gain i just keep mine... right now i feel a little bit hungry because the last time i ate today was 16pm... it's just i "forgot" to eat or was just too distracted to do anything... (today is one of those days i don't leave my room, i don't do anything else but binge watching all day). gosh, i'm just gonna sleep, it's 3am