Managing mommy life

How have you or are handling mommy life? My baby is 3 weeks & I’m breastfeeding but agh, sleep deprivation sucks! What sucks is that it actually makes me physically sick, I get nauseous & headaches! I don’t like waking my boyfriend up at night because he works 12+ hrs so I feel bad. Any tips from someone who has been in the same situation? Also, there’s times I struggle to put my baby to sleep, she can be so tired but doesn’t fall asleep even after me rocking her that she starts crying. TIA!!