Going back to work

My partner and I decided I would stay home with our Daughter until she started school because we was lucky enough to be in a good financial position. That position has changed and I'm having to go back to work. She turns 1 on Saturday and I have spent every day of that year with her....I start my new full time job on Monday and i already feel emotional about leaving her. I know she will be okay and probably won't even miss me....I on the other hand am going to feel like I'm missing a limb. Has anyone got any advice on how to ease the transition?