is it possible to restore breast milk?🤔

I was getting frustrated with pumping storing feeding so I started supplementing with formula for about 3 days but now my daughter doesn't want it anymore she's only drinking about an ounce of formula at a time but the frozen breast milk she finishes the whole bottle. I tried pumping and nursing but I'm only getting half an ounce per boob. They don't feel full anymore and rarely any let downs. Are dried up to the point of no return? I really want to start building my freezer stash again before I go back to work next week