My sons eating is driving me insane

Breakfast- oatmeal and 2 eggs with some fruit and milk, a snack and a few bites of my breakfast (all before 8am, wakes at nearly 7)

Lunch- full sandwich, sides of pickles, cottage cheese, fruit, salad, crackers and sometimes a cookie, yogurt or a kind bar

Dinner- literally a portion I would eat of whatever we’re having, sides such as a pickle or fruit/veggies/dip/boiled egg

In between, he snacks on rice cakes/veggies and dip/other random snacks

I’m a single mom, my monthly grocery budget for us two is 400, and that has become not enough. I try to always have food present because I didn’t as a kid, we got 2 meals a day and that was it, no snacks or lunch unless we went to school, and the two meals were like an egg with ketchup for breakfast and maybe pasta for dinner, otherwise it was one slice of pizza or something similar. I came home with headaches after school because I wasn’t eating enough, so I try my hardest to provide for my son. But it’s becoming so mf much.

It’s a constant “I want this I’m hungry for that” and it’s stressing me the fuck out. My son isn’t overweight at all, he’s in the 80th percentile in both height and weight.

I’m mostly venting. I know he’s a growing human and he needs energy, but sometimes when I’m budgeting or can’t afford some staple snack that he wants, it makes me feel really gross about myself.

If you got this far thank you for reading, I just needed to yell about it