You can't do everything at once. You can do one thing now.
My three daughters are all dancing in the Nutcracker ballet this year. I've been very overwhelmed with their dance class and rehearsal schedule, which between the three girls takes up almost every minute of my time after school on weekdays and all day on Saturday. At times I've wanted to throw in the towel, because I just can't do it all. The positive thought for today has been the only thing that's kept me going. I don't have to worry about everything on the schedule every moment of the day. I only have to do one thing at this moment, then worry about the next thing next.