Breastfeeding blues

Hi! Just gave birth a week ago. Pero yung bm ko is laging 2-3oz lang from manual pumping. Di maka latch si lo kasi inverted nips ako nasstress sya na lagi umiiyak nalang so nagppump ako. Kaso lagi yan ang pinaka max kong nakukuha tho yan lang din naman laging consume ni lo. Any tips? Im currently taking malunggay caps, milo at oats sa morning at evening tas more water. Na sstress ako tuloy lalo lol since yung pedia ni lo inadvise kami mag preemie milk for lo kasi pahat at maliit sya nung lumabas.