I hear you - I experienced the same thing when I was on maternity leave with my daughter. The stress of life and work and a new baby can be overwhelming. The best advice I can say is to take a deep breath and know that things will fall into place. At the end of the day, nothing is more important than caring for the new baby in your life - enjoy that time, it goes fast!
Let yourself lean on other people more than usual - trust that they will be there to help you (family members, co-workers, etc). They want to help, so be sure to let them! Good luck and congrats!