How do I stop eating so much? I vomit if I overeat & due to constipation, fart is also very smelly.

Eat more fruits for fiber to help with constipation! I’ve been eating apples since they’re sweet and easy to eat. As for overeating, I don’t have much advise as I’m the same. But I find as time goes by I naturally started eating less. Your body knows what it needs, this is all normal and will go away :)

Maybe you can try splitting and eating many meals but in smaller amount? It can spread across the day so you won’t overeat and vomit.