True reflux babies may get some relief from gaviscon, mylanta etc for a short time, but they arent good to use long term for reflux management of babies. Zantac and losec are th two most common reflux meds that are given to reflux bubs but they do work differently. My daughter was put on zantac first and I found it made little difference, but the difference losec made was massive. Most people do find that Losec is much more effective. Both my kids have been on losec longterm. My son just turned 1 and is on 10mg and my daughter is 3.5yrs and still refluxing (silent) and was on losec before we changed to nexium.

Zantac is made in a syrup for babies and losec can be made up in a suspension or you can dissolve (not crush) the tablets (though I found that method hard) I used the suspension until my babies were old enough to have the dissolved tablet put into their baby cereal.

I am a member and volunteer for Reflux Infants Support Association (RISA) We have a facebook page as well as the website which has lots of articles and information and advice aswell as access to the forums for support if you join.

I would be going back to your doctor (or another for a second opinion) and ask about medication. Alot of GPs knowledge of infant reflux is lacking so a referral to a paediatrician may be warranted.

Reflux can be caused by intolerances, however, there are many causes. The one way to see if your baby is reacting is to cut it out of your diet for up to 3 weeks (it can take this long to be completely out of your system). Do this one at a time eg, dairy, then soy etc so you can tell what my be triggering/contributing to it.
The fact that you have allergies in your family can be an indicator but by no means an answer.

If you have any other questions, please ask. The best advice I was told once when I really wasn't coping with a screaming, crying, non sleeping or settled baby is that I was doing the best I could in a difficult situation and you cant treat a reflux baby the same as other babies as they are reacting to pain, so you need to do whatever feels right and best for you and your baby to get through the difficult months (or years in our case!)