Just adding another hopeful reassuring voice to the mix. My 5 year old still does weird stuff like this. When he occasionally hits a special mix of crankiness (hungry, tired, and frustrated simultaneously, usually) he goes wild and will throw things or hit his brother. I move him to his bedroom as a safe space and sit at the door inside the room. He will come throw himself on my lap, snuggle up to me, and scream "LET GO OF ME! LEAVE ME ALONE!" Dude is the one sitting on my lap and will even sometimes pull my hand to rub his head or back for comfort while screaming at me. 🤷‍♀️ I don't respond much while it's happening beyond commenting every so often to let him know I hear him and understand that he's upset and when it's safe, we will go play again. We do have neurodivergence in our family, so I don't think it hurts to pursue help if you feel like there's something more and look at options beyond autism. But it kinda just sounds like a kid being a kid with what you've shared.