Breast milk woes

My milk supply is dropping and my baby is eating more and more! I’m so stressed about it.

She feeds off the breast for half the day and then has bottles of expressed milk for the rest with her dad. I pump at every feed but miss 8 or 9 hours while I sleep.

The thing is he’s making up 150 ml bottles for every feed and sometimes she drinks them. But a lot of times she doesn’t.

Right now I’m here crying while I struggle to pump out 70ml (both breast combined) while she’s left over 40ml from her feed.

What do I do?

I need the sleep for my mental health but maybe I should sacrifice it to pump during the night.

Or maybe I just go to formula but I wanted to do breast milk until 6 months.