My daughter will be 4 months on the 3rd and I have to return to work on the 11th. Just laying here…

My daughter will be 4 months on the 3rd and I have to return to work on the 11th. Just laying here in deep thought and realizing I'm not ready to be away from her. The longest I've been away from her is a few hours here and there when I get my hair done or nails done. And even though I'm only going to be working on weekends it still hurts knowing I won't always be there. I never knew I would feel like this ... are there any mommy's that been in my situation? If so how did you get through it?