Postpartum hormones

I am only 3 days PP but I feel as if I am an emotional wreck. I am overjoyed to have my baby girl & a loving helpful fiancé & I am also terrified of this new part of my life. I had a long cry in the hospital & talked t my fiancé about my feelings & he was of course the best, but I’m worried that my emotions are flipping like a switch way too fast. Just this evening he had to be somewhere for a few hours & I’ve been crying that he’s not here with us, and then crying over how perfect baby girl is. I’ve heard your hormones are crazy after giving birth & im just wondering if this is normal or not? Thank you for your help!