Nonstop crying

Today’s his first day home and he constantly cries and wants to nurse. Even when I’ve fed him with a good latch and good position, he will continue to search. Thing is, when I go to feed him again he will start crying in the middle of suckling. I am expressing colostrum well.

I feel like he’s in pain, but i don’t know what to do. He got circumcised and all those hospital shots, and had an upset tummy with throwing up due to amniotic fluid for his first day and a half.

Advice pleeaaase