Tantrums

How bad are your kids going through it right now? My son is like an animal some days. He's such a happy well behaved kid but a flip switches and he's like possessed. Screams to use the potty, hits his head out of frustration, sits in his highchair and screams through an entire meal, throws food, it's on occasion tells me 'I said no!!'. I know it's all normal but sometimes it's scary!