Lactation supplements/food

I'm going to be going back to work right after Christmas. My son is a week old right now and we are breastfeeding. it's been so hard, he's been eating nonstop and is crying when he's not. I'm afraid he's not getting enough milk when I feed him because I just pumped and over the past 3 hours I've gotten a total of 4oz and he just drank a bottle and finished all 2 oz in one feeding ☹. I don't mind feeding him this much right now because I'm home all day everyday, but once I go back I will be gone for 6-8 hours a day. I feel like I'd have to leave at least 5-6 full bottles of milk for him and there's no way I can pump that much in a day while also nursing him. Do any mommas have any advice or good supplements that'll help me? very stressed first time mommy here 😔