Silent reflux

My baby is 3 weeks old and we are really struggling with what I think is silent reflux. She is incolnsoleable after a bottle, has hiccups regularly and is very hard to settle in general. We have tried infant gaviscon - for about 6 feeds so far, I'm inclined to say she's worse since that. Any advise or if anyone who has been through something similar I would really appreciate the help on how to get her feeling more comfortable