Considering supplementing with formula

🐘🐘🐘 • 👧🏼 born 1/19/16. 👼🏼 lost 9/15/17. 👼🏼 lost 11/26/17.
My DD is 6 days old and has been feeding for two hours straight. She just isn't satisfied and she gets tired. Second night in a row. I'm so dehydrated and exhausted I think I might have to add formula to the mix. Ps I can't pump more than 2 oz... I feel like such a failure