Mommy I'm about to lose it completely. The son is not sleeping during the…

Mommy I'm about to lose it completely. The son is not sleeping during the day, I'm rocking him for an hour so he can sleep for at least 15-20 minutes. There was a regime before, but after three months it all went away... He doesn't cry, just lies there, or screams to be picked up, I start putting him down and he cries again. What is this?