Absolutely exhausted!!

I’m 15 weeks 4 days and I am completely wiped out all the time. It’s my second and I do have a 1 year old (who just turned 1) and I am a full time school teacher. So I know that I’m going to be a little tired, but holy cow! I fall asleep driving to work! It’s 8 pm and I’m in bed for the night! As soon as the hubby walks in door I head to bed! Any words of wisdom or tricks to boost energy? I exercise and eat well (when I can stomach food)! I just feel overwhelmed and like the energy will never come back!