Trying to sort out my feelings

Currently a month pp & everything is great with my little one, my husband & my family. But it's like I still feel unhappy somehow. Like there's an empty pit in my stomach. I don't have any bad feeling towards my baby. In fact, he's keeping me afloat, as is my husband. I just hate not waiting to eat and then, bingeing. And constantly feeling sad for no reason. And I definitely don't want to tell a Doctor cause I don't want to harm baby or me and I don't want to be medicated for no reason. Plus, I'm breastfeeding...