4.5 yr old with aggression/frustration issues

Hi sisterhood
I'm having some trouble with my 4 year old son. We've noticed over the last year he's been getting really worked up over the smallest things. If he's having trouble with something he will throw thi ngd across the room and scream in frustration. If he doesn't get to do what he wants at the exact time he wants he gets so angry. This week at preschool he didn't want to wait his turn and they said he just turned in an instant, throwing cards all over the room, picking up blocks and threatening to throw them at people, punching into the lounge. They ended up putting him outside to run off some of his anger but it took him about 30 minutes to calm down. I've seen this behaviour at home too, lashing out at his sister, kicking me and punching my partner. Yesterday he couldn't get his shoes on so he hauled them across the room with a scream. When he's not getting frustrated over things he's quite a sweet, caring little boy with a huge heart. He is very smart, can write his name, does simple maths and knows numbers, colours, etc. He just gets this look on his face and within seconds he's losing it. We've tried all the strategies we can think of to help him but I'm at a loss and so are his teachers after last week. Teachers have suggested seeing a peaditrician to rule out anything we may be missing but any other help in the meantime would be greatly appreciated