at wits end

At wits end and just dont know how much more I can take....

Hi there sisters im at wits end atm with my 6yr old n 3 yr old n hubby isnt helping the situation at all. Both my boys have been really playing up for a few months now I think its because im haveing baby number 3. My problem is they do not listen to me at all unless I start screaming at them hubby just has just handle them at all they are doing his head in aswell but im over the yelling crying screaming smacking thats going on to the point that I dont even want to bring our new baby home becouse its just to much. I know its the age n what not I really cant take much more im stressed non stop to the point im ready to just go admit my self to hospital so I can have some time out. Not sure what im after here but please no judgment I get enough of that already with comments from hubby that ive let them go for to long n I need to stop letting them get away with everything but yet his been home full time for the last 3 years his self but yet its all me.