Needing a good postnatal supplement for breastfeeding

Hey ladies! I am frequently getting sick and extremely worn out from the simplest things. I am having a hard time keeping up on housework and just every day tasks. My husband works 10 hour days and helps in the evenings, but there's just not a whole lot he can help with. My 5 month old is waking frequently and is taking pretty much all my time and energy. So I think I'm needing a lot of nutrition. I'm really not doing too much, I'm just getting more and more drained!