Fatigue

I'm having such a hard time with my pregnancy. I am beyond exhausted. I'm a middle school teacher which requires me to be consistently moving. I'm taking my multivitamin with dha. I am consistently snacking. I'm sleeping 7-8 hours a night. I'm trying to stay hydrated. This is my second pregnancy. My son will be 11 in two weeks. I don't know what else to do. Someone please  help! I'm due 11/11/16. My first appointment is mid April.