Baby wont sleep

Sammy

My 5 week old baby stays awake for 2 hours a time sometimes, then gets so overtired he just screams and cries non stop. I try to get him to sleep by swaddling and rocking him but he wont sleep. I give him the paci he barely takes it. I lay him in his bassinet he just stays awake. I don’t know how to get him to sleep! Please give me advice.

He is completely full, clean diaper, he just won’t sleep. He’s been this way for about a week or so now.