No sleep I’m beat !

I need some advice my baby is now 4 weeks old (she is a preemie born at 34 weeks) she stayed in the nicu for 8 days I stayed in icu for 9 days , I only pumped and begin pumping and dumping due to my medication I was on . So we’ve only been latching for give or take 2.5 weeks I started off only doing it I half a day and giving donor milk . Now I’m latching all day and trying to do it at night , but I can’t stay woke and I’m feeling hopeless because I want her to get what’s best and being a preemie I just wouldn’t feel right giving her can formula. How do you guys stay woke ? What advice can you give me