Idk what to do any more

I had a new baby bout a week ago and have a 3 1/2 year old, the 3 year has been so bad and acting out like crazy it’s makin me so sad and upset and so afraid it’s goin to have me go through depression, I did with him and I’m so afraid to go back to it, idk what else to do I’ve been nice I’ve done everything I can do to make him happy, my husband hasn’t helped much with it but just get mad to. It’s so hard between all of this and what to do. I need help, goin to talk to my mom and tell her but I’m afraid she’ll just tell it it’ll all pass and to just keep up wat I’m doing, I’ve not been Puting my 3 year old to bed my husband has been and tonight I tried to and it was a big ass mess to do, he just acted out, so I had to leave him cuz I was crying. Any ways TIA