Sorry to hear about your trouble. My little girl also suffers with reflux. Thankfully, a combination of Gaviscon and getting older is helping hers. From personal experience I found that Infacol made my babys reflux worse and found she vomited even more.
There are other medicines that can be given if Gaviscon does not work, typically ranitidine. This is something you will need to discuss with the GP.
If it is any consolation, Nancy will grow out of her reflux and it will ease as she grows.
This is quite a good site for support etc
http://www.littlerefluxers.co.uk/
Good luck x