Bottle Refusal

I have a 2.5 month old. He was taking the bottle from week 1 as he was not latching well, so I was giving him EBM in a bottle. When he was 1.5 months old he fell sick and so I latched him directly as I heard the antibodies will help him. However after this, he has refused the bottle completely and will cry and gag when we give him a bottle. He will only want direct latching. I have tried other bottle brands, I’ve tried having someone else feed him while I’m in another room, I’ve tried nipple shields. But no progress. I am starting work soon and will need to send him to IFC. I don’t know what to do as the IFC informed they only bottle feed and wont feed the baby through syringe/cup feeding. Please help!!