Hi, ds2 now aged 20 months still has reflux, was on Gaviscon at first which didn't help noticeably, then on domperidone and ranitidine and now on domperidone and omeprazole, which has helped a lot. There's loads of info on the web about reflux, try looking at pollywogbaby.com for a start, plus \link{http://www.infantrefluxdisease.com/\infantrefluxdisease.com} for lots of info including how to get the doctors to take you seriously, and the \link{http://www.infantreflux.org/forum/default.asp\infantreflux.org forums} are really good.
The medications take a while to take effect, allow it about 2 weeks before you say they aren't working. However, I'm really glad you're going to push to see a specialist. Our GPs kept telling me they thought ds2 was doing okay, and really didn't understand how much he was in pain and how completely desperate I was getting. Once we saw a specialist paed and ds2 was on the right dose of medication it made a huge difference. Talk to the paed about formula, about 60% of babies with reflux have either a milk or soya intolerance so it could be worth trying him on Nutramigen or Neocate (although they are said to smell and taste horrible).
However, even with the specialists you have to be very pro-active. They aren't going to automatically increase doses unless you tell them that your child is getting worse, or has put on loads of weight (and for us this was a bit of a catch22 but that's another story). I found that calling the doctor's office with ds2 screaming in the background got me the swiftest response! You also have to watch out with ranitidine because after a while the body just builds more proton pumps (which create the acid in the stomach) and ranitidine stops being effective. Lots of people have found better results with proton pump inhibitors (PPIs) like omeprazole. After ds2 went on omeprazole our neighbour commented that he was really showing his true self, and that it had seemed like he wasn't all there when on ranitidine. Again, it's up to you to tell them when you think he's getting worse because if you don't tell them anything they will assume it's all working fine.
If you've looked into the amby hammock you've probably already found out loads of stuff about managing the reflux, but here are a few thoughts about trying to make it a little better for you, your ds and anyone else in the house:
Try to avoid positions where his stomach is compressed, e.g. in car seat, buggy or 'Bumbo'. I started carrying ds2 round in a baby carrier loads and it really helped. When changing nappies, do it on an incline (head higher than legs) rather than lying him flat and roll him from side to side to wipe instead of lifting up his legs
Try giving more frequent, smaller feeds so there's less in the stomach to come back up.
Try to keep him upright after feeds. The advice tends to say 20-30 mins although I personally found this very difficult to keep to.
Get as much help for yourself as you can - around the house, helping to look after your son or babysitting so you can have a break from time to time. It's really important even if you feel you don't want to burden other people because your child is ill. The whole experience is so draining, you will need rest so that you can deal with it better.
I really wouldn't wish this experience on anyone, so I feel for you and hope you find a good doctor to help you and your son get through this.
hth