Week 4...and I'm already on the verge of shedding tears 😣😭

it's been 4 weeks since I've had my daughter and I feel like I'm going to pull my f****** hair out. I have a 2 year old's who's going to be 3 in December and he seriously has no limits to his behavior. it has gotten so bad since his sister's been born. please someone tell me I'm not alone! I'm not going to postpartum depression I know that, but these constant Tantrums that my son takes is becoming too much. I need some advice on how to get his behavior in check.