I can certainly see why you are feeling daunted i'm feeling daunted by the thought of having a newborn and a nearly three yr old that runs amock most of the time.
I think we learn to cope with what ever comes our way and yes it will probably be stressful but on a night like that i would probably make sure i had a meal in the freezer that i could quickly heat,eat and devour without having to slave over the kitchen stove for the night. That way your babies will have you solely and you will find what works for you