Back to work soon - baby won’t take a bottle 😩

I had baby #5 in January and I have to return to work as a teacher soon. He will NOT take a bottle and I don’t know what to do, I’m so stressed. I’ve tried 10 different brands, all with fresh pumped milk in them so I know it’s warm and tastes the way it does when he nursed. I’ve tried waiting til he’s very hungry, waiting til he’s calm and sleepy, facing away, standing up, having dad or grandma offer it, etc and he has never latched onto a bottle nipple even one time. He rolls his tongue around like he doesn’t even know what to do with the nipple or he gags on the nipple. Any advice??😬🤦‍♀️