How can I feel better?!

I am so depressed. I cry everyday & I can't control it! I'm 3 days postpartum & I can't stop crying! I'm always so sad! My son is 10 months old & my daughter is 3 days old. Honestly I think it's because I miss it just being me & my son. I miss the alone time we had. I don't regret my daughter at all I love her & I'm glad I have her but I do wish I could've had more time with my son & idk how to handle the way I'm feeling! I just wanna be happy again!