My first Saturday was so hard ... it was day 7 for me too ... just seemed like a big yawning abyss in front of me, and I didn't know how I was going to get through it. Not just Saturday night, but the rest of my life sober.
I tried to remember I didn't have to tackle the rest of my life, just this one evening. Or maybe just an hour at a time.
Just know that you're not alone. Maybe find one small thing you can do this evening -- something to read, soothing music, a bath, anything that would comfort you? It does get easier with time.