I had a 4 yr old like that and it was behavioural and for attention. He'd be playing fine like yours then cry out when we had to clean up. I had to give him time outs. I said I understand U are sad and miss ur mommy. It's ok to miss her but screaming and crying like this is not ok. If u wish to do that then do it in time out. And he did. He needed a moment to himself to compose himself. I made sure to leave some toys out so once he was done he cleaned up and didn't pull a crying stunt to get out of cleaning. Basically u have to tell and teach him at age 4 that yes it's ok to be upset and miss mommy all u want but at 4 yrs old there are proper ways of showing it. Screaming and acting out is not acceptable and warrants a time out. It worked really well for my guy. After two wks he was done. He probably thought it's boring constantly being sent to time out so he stopped the screaming.