Stomach issues / breast feeding

Hi Glo mommies! Just a question on whether anybody has experienced feeling nauseous or constantly hungry to the point it makes you feel sick even though you’re eating plenty while breast-feeding? I’m not sure if the two go hand-in-hand with it being my first I’m still learning.  i’ve been doing everything I can to make sure I’m snacking more and drinking more fluids throughout the day but it’s just not seeming to cut it. Is this maybe just a postpartum thing? Of course I plan on asking my doctor, but until then I just wanted to see if anybody else had any ideas or similar experiences