Idk what to do.

I have had eating disorders my whole life it first became when i was stressed or anxious i started over eating but now it's were i don't wanna eat at all. I have made friends with my Bestfreind cousin she's like a little sister to me and im like an older sister to me. she was hugging and laying on me today and i didn't eat all day so my stomach was growling from hungry and it hurt to have her look at me and say are u not eating again? i lied i told her i was just my stomach hurt but idk what to do it's like if i eat i start to feel sick and just stop ill take maybe one or 2 bites of my food then i'll be done. my mom has started to see it also. and it sucks