Help!!! My reflux baby of 15 weeks has suddenly...

Help!!! My reflux baby of 15 weeks has suddenly decided that she will no longer drink her bottles. She has been bottle fed since she was 3 weeks of age. Now I am lucky to get 100mls into her. She shakes her head, gags, screams, whatever it takes not to drink her bottle. I am fighting with her every feed. Any experience???