I am very busy and don't know what to do

I am literally worn out and I don’t know what to do. I am a teacher from 8-2, I tutor kids from 2-3 and I also do another job from home. For the next month or so, my son has swim lessons in the middle of all that. Throw in taking care of my dog, my kids, and myself and I’m at my wits end. I do all of this work because I have to in order to take care of my kids and make ends meet. I am absolutely miserable. I can’t continue like this and I don’t know what to do.