Mom guilt / breast pumping

FTM here. While baby boy was in the NICU I was pumping every 3 hours and it was so exhausting. He’s finally been home for about a week, and I haven’t been able to pump like I used to. I’m sooooo tired. He wakes up every 2 hours to eat, he’s a horrible spitter. By the time his feeding session is done I’m just ready to go back to sleep. My milk supply has gone down, I’m trying to get back in the groove of pumping every 3 hours. I feel so guilty and worried my milk will dry up- Will doing every 3 hours help again? I want to be the best mom I can for him.