Back to Work tomorrow Help!

I'm back to work tomorrow and I am all over the place. Sometimes I feel prepared then as it gets closer I feel on the verge of tears. 😔 I am a teacher and I had my baby last May and took entended time. Now I knew I would be going back to work but I can't help but feel so sad. My mom will be watching my baby, which I know I'm extremely lucky but I'm still sad. Any moms already back to work?