first day alone with both children

Needing some encouragement, advice and just wanting to vent honestly. my sweet little girl is 6 days old tomorrow and my husband is going back to work. I'm not going to lie and say these past 5 days have been hard. I've barely gotten any sleep and I'm just hurting everywhere. I'm super nurvose to be alone with my two girls tommorow. I know I can do it. I just need to calm down and focus on what is and not what will be. pray. pray. pray. I remember that's the only thing that got me through some of the harder parts with my first daughter. does anyone have any advice, tips, encouragement to pass along to a mother of a newborn and a 1 year old? (today was my first baby's birthday, kind of crazy to think how big she's gotten) Thanks in advanced!