Not producing milk

Help. Please. I’m barely producing any milk while pumping. I’m exclusively pumping. Obviously I have to supplement with formula since my supply is so low...I barely produce 1z each session and I try to pump every 2 hours. My supply dropped when I was admitted about a week after giving birth. I had postpartum preeclampsia, and that day I had a CT scan done and I was on magnesium and I couldn’t breastfeed due to the contrast for the scan, and because the magnesium literally makes you so drowsy youre on strict bed rest for 48 hours. & with the corona virus going around, they recommend baby stay home with dad.

So she was strictly formula fed for that time. Anyways I really need advice to up my supply.. especially since formula is hard to come by because of this panic buying.