You would say that someone is depressed, distraught, traumatized, or miserable. Or they could feel abandonded by their mother which means she has left the child alone for too long. To use slang: She is feeling very down today. He feels like shit. She is really out of it. He is inconsolable, he won't even talk to us.

The expression "heart broken" is often used when someone feels betrayed. "Dejected" is a good one, as mentioned.

Do you mean "a son reviled by his mother"? He could feel "horrible", "dejected", or "worthless".