Breastfeeding/Formula Feeding

My baby girl is 1 week old. Breastfeeding has already been a wild ride and I’m starting to feel burnt out already. She lost 14% of her body weight so they had me start pumping to get my supply up and Lactation provided us with donor milk (thank you to donors).

Currently we are breastfeeding as much as we can. Then, give 1oz donor milk by syringe as she is suckling on a finger. Then, pump 10-15 minutes per breast. This whole process takes around 45min - 1 hour to complete. We have to do this process every 2.5 hours so our days consist of nursing, donor milk, pumping, sleeping, repeat. (Sometime getting to eat ourself).

My husband goes back to work in a week and I’m not sure I can do this process without him.

Has anyone else switched to formula this soon? How do you make the switch? Can I do formula and sometimes breastfeed?