Parenting: Friends Talking Community

Ok so i am a couple of wks away from giving birth to my 5th child and i am having a serious problem with my 2yrs old. My son is atrting to show signs of regressing n behavior problems, for example he tries to hit me when i take something from him he talks back he yells n screams at me he has become very jealous of my 1yr old n is always trying to hit him. when i tell him that i am gonna spank him he says he will stop, then 2 seconds later hes right back at so i tell him to go in his room on timeout. he goes in his room but once he sits on his bed he starts crying n screaming n when i say screaming if was outside n heard it u would think he was getting murdered n i don't even be in the room with him. now i know that this behavior is somewhat normal bcuz of the fact that i am about to have another child n daddy is at work all the time but there is times where i wanna pull his pants down n give him a good spanking but i know that not good to do n i know when i yell and scream at him it not good either but he has become very hard to deal with lately n my patience is very low bcuz there is alot going on n everything is on me, bcuz my fiance is at work all day long. now there is one more thing i need help with we recently moved into my mother apartment bcuz she just bought a house ow the first couple of wks here he had no problem sleeping in his room with his brother but it seems like for the last week he has been waking up in the middle of the night and has been giving me such a hard time to sleep in his bedroom i know he is tired bcuz if i put him any where else he falls asleep without a problem but i don't understand why he now all of a sudden doesnt wanna sleep in his room.
if anyone can help me it would be greatly appreciated, thank you.