can someone help!

i’m exclusively breastfeeding and baby always still seems hungry after feeds so I pump and give her the milk that I just expressed.. so I can no longer stash milk and it’s making me very frustrated.. i’m going back to work in about 3-4 more weeks. anyone have any tips? i’m only getting 2-3oz after feeds and if I get very full which is rare i’ll pump 8oz but only if she hasn’t eaten from the breast..