Silent reflux experience?

Ruk • In love with my baby girl born in October 2016💗
I'm a first time mum to a 6months old. She has silent reflux since she was about 4 weeks. I have been advised to give omperazole also known as losec mups. Has anyone used this on their los? How long are supposed to give it for? And how often? I can't get in contact with my gp as I'm on holiday. All help will be appreciated x