My stomach feels weird, what should I do?

my mom stopped breastfeeding me a few days ago and i have not consumed anything since then, ive seen milk in the fridge, should i drink it or is it poisonous to everyone but adults. I mean ive seen adults eat a lot of food and i suspect what I need is food but im afraid to eat. I've never done it before. Is it safe? What is safe to eat? my mom has a bad temper and beats me constantly so im afraid to take something she wants to keep. What should I do? The feeling's getting worse.