advice about SO..

I've been stressed out all day because we're going to the zoo and we have 3 boys. And mainly I do all the planning/getting things ready plus the boys ready. I tried to express to my SO that I need help doing all of this otherwise I'm just one big stress ball. I tried to ask him his opinion on what we should do for certain things and he's just in the kitchen.. Eating.. Isn't helping with anything. I get so stressed I go lay down. So our 4 month old is crying and he only gets up when he's sick of hearing him cry and then he comes to find me because I guess he just expects me to do everything. So he comes and finds me and pulls the covers off of me, takes the pillow out from under my head.. Shakes the bed.. So I screamed at him and told him to leave me alone!! Well then he gets FURIOUS... I have never seen him get so mad.. He has never put his hands on me. He slaps my phone out of my hand and is SCREAMING at me and he starts to spit at me he was that mad and then gets on top of me (not literally sitting on top of me, but he was on his hands and knees) and I just cover my eyes and just start crying... I tried to explain to him that I'm hurting mentally before this all happened and after he got on top of me he left the room and came back calm and keeps on asking me 100 times "how are you hurting mentally?" I just keep on telling him to leave me the hell alone!!