Rejecting feedings

My baby is just shy of 7 weeks old and we hit cross roads where he is rejecting his bottle. I breast feed and pump and bottle feed. We have been doing this for awhile now. But starting this week he is fighting to eat and crying non stop. I can get him to calm down and he will nap. And I’m able to get him to eat 2 oz at a time but nothing more. I’ve tried gas drops and the gripe water. But he still isn’t wanting to eat. I’ve tried new bottles, faster flowing nipples. When he’s chill he’s such a happy baby. I’m just not sure what to do with his feedings.

Has anyone else’s baby went through this? What did you do to help get them to eat? How long does this phase last?