HOW AM I GOING TO DO THIS!?

So I'm expecting a baby girl in two months.. I have a 18 month old boy who is a serious pain in my butt. I mean I love him to death but he is so very high maintenance. I have a hard time even just staying sane dealing with him throughout the day, let alone having another newborn in my house!!! I don't know how I'm going to do this. my husband works 14 hour days and my family is not alot of help.. I feel like my brain is going to explode from stressing about this baby. I'm exhausted from chasing my boy around and the thought of another baby makes me want to cry. can anyone give me some friendly words of advice 😭