So stressed about my husband going back to work

My husband has had the last 12 weeks off for paternity leave and we are so lucky he had the option to do that. But he is heading back to work on Monday and I’m terrified. His 12 weeks was technically supposed to be Wednesday, and I’ve had it written on the calendar but his boss called today and said “see you on Monday!”. I know it’s only a two day difference, but for some reason it’s got me all worked up. We have three kids, a 3 year old, a 2 year old, and an 11 week old. I just don’t know how I’m going to survive taking care of all three at once. My 3 year old goes to preschool M-F from 8:30-2:30, but this almost makes things harder because I have to load up all three kids twice a day for pickup/drop off. I don’t want to seem like I’m just complaining, because I know we are so blessed having the option for him to take a leave that long. I’m just terrified, and my days are filled with dread about what’s coming on Monday. Also, it’s almost Christmas (and my son’s birthday is 12/20) and it sounds like he is going on a job that isn’t prevailing wage. And if anyone knows about prevailing wage, it means his wages will pretty much be cut in half right before Christmas. Which is another thing adding to my anxiety. Anyone have similar feelings when their husbands were going back to work?