Aaargh - just typed a long message and then MN lost it! Will try to remember the gist...
poppet explain your concerns and see what the paed says. The normal treatment path (IME) is non-medicinal ie propping etc, then gaviscon, then G with ranitidine and then the heavier drugs. I hope they listen to you.
Lucy how old is your dd? I've not bf a refluxy baby beyond 10wks. Routine will never happen with ds. He's so busy sicking up milk that he's hungry long before he 'should' be!
Bubalie the constipation might sort itself out. If not, it might be worth knowing that my ds was the same with gaviscon & C&G but fine with gaviscon & Aptamil.
Please, please speak to your gp and explain how much this is upsetting you. I'm having a good day today but if you read above posts you'll see that bad days make me sound like I'd be better off speaking to the Samaritans rather than posting here. And I'm not trying to be funny. Do you have any family help? Even an hour or so every few days away from the crying can really help.
I'm also in the position where ds is gaining weight still. DD1 had it so badly she was hospitalised for FTT - very unwell, yet never had a day's bother with it. DS2 however is gaining weight and yet is bothered by it all the damn time! I really had to fight to get him seen let alone diagnosed. Looking back, I think his weight gain was tailing off before we went dairy free, but he's thriving again now.
Please none of you underestimate how much this can affect you and these precious early days with your baby. It's tough, we all know 
But we're all here and we all help eachother through it.