won't eat

Allison
My girl is 4 months old and starting yesterday she has been screaming when I put her up to me to nurse. She's exclusively breastfed and has been dealing with acid reflux and on zantac for months now. The dr has upped her dosage and we're giving that time to kick in but I'm not sure that it's ok that she isn't wanting to eat at all? No fever or cold symptoms or signs of an ear infection. She'll eventually get hungry enough to eat for a couple of minutes but I'm worried she's not getting enough.