Breastfed and formula fed

My daughter is 7 months old.. she has been EBF since she was born. We’ve had many ups and downs, my supply has dropped before was prescribed domperidone and also required lots of pumping. I feel like my supply has dropped again. I’m exhausted and frustrated. Does anyone have experience with a combination of both formula and breast milk? How much and what kind of formula do you give your baby.

I still really want to breastfeed and will try to pump as much as I can. But my daughter is hungry and my supply simply isn’t enough. Thanks!!