Ugh stressed

I feel like I'm going crazy. I have a 18 month old who is teething and keeps waking up multiple times in the night fussing and crying and I have given her medicine. I am about to have a newborn in two weeks. I am still working 40 hours a week and have a 6 year old too that I have to get up on the morning to go to school. All I want is some sleep!! How will all of this balance out, I feel like I'm going to lose my mind!