Newborn eats hourly

Help me! My 2 week old will not sleep for more than 45 mins at a time. He wakes and seems hungry so I feed him 1.5-2.5 oz each hour in hopes that he will sleep a little longer but every 45 mins to an hour he wakes up and cries. He's breast fed but with a bottle. So I pump. It's getting exhausting since my husband is back at work and I got up all night with him hoping he would sleep today but nope. Same thing. He used to sleep 2 hours then eat and repeat. Now he lays in his swing and grunts until I hold him or feed him. What am I doing wrong?