Back to work missing my LO

How do you guys do it? I've been a SAHM for a year and almost 2 months. (I have a part time job working 10 hrs a week) but I just got another job and I start tomorrow. I can't stop crying thinking about how I'm going to be missing out on so much! I am already going to miss his Halloween. 😭

How do you manage? How do you make up for the lost time? How do you not feel guilty being away for so long? I am having a really hard time. Although I am very grateful I got to spend his 1st year with him I hate to miss the 2nd year!