Hi aileymouse, sorry to hear about your baby.
How long has she been on the ranitidine? It's a really good med to have, especially compared to Gaviscon. So keep up with that.
In terms of the intolerance, I was told that they don't test for intolerances until a child is one but I have read online about some babies being tested earlier but I think that's only for really really severe cases.
My son was put on special formula (neocate) for a suspected cow's milk protein intolerance - they can't for sure confirm it is that but his symptoms went away dramatically after being on this formula and once he's fully weaned they'll try and give him a difference formula, then soy milk after 1 year, then introduce small amounts of dairy until he hopefully grows out of it. His symptoms were very bad excema, congestion, mucus, blood/stringy mucus in poo and poor breathing. He also has laryngomalacia (floppy windpipe). I actually think the main reason they gave this formula was his terrible breathing (his chest would go completely concave) and I must be in the right postcode as i've read on here and other forums it taking months and months to be prescribed it.
So what i'm saying is don't give up breastfeeding and think formula is your answer just yet. The main thing you can do is cut out (or at least reduce) your dairy consumption. Also go with the normal reflux soothers - burp frequently during feeding, try and keep upright after feeding for a while, elavate cot/pram etc etc.
I know what you say about going to the hospital though....we got sent by the GP to the hospital because his breathing was so poor and it was the hospital that prescribed his special formula and ranitidine. And now we have a direct gateway to the consultants because we've been on a couple of overnighters in the ward. Although I had my consultant appointment today and it was booked way back in JUNE! Most people i've read about on here having problems with getting the right drugs were going through their GPs.
Take her to A&E if she is really really bad, but just be prepared they have to offer the lower ends of the medications first. So gaviscon, then ranitidine, then domperidone, then omeprazole and so forth....because for some if not most reflux babies the first rung of medication (gaviscon) works like a dream.
Good luck, oh and keep holding your baby upright a lot generally so she gets good head control and do tummy time often so she learns to control her head/neck and gets stronger. Luca has been able to sit upright with little support for well over a month now (he's 5 months old) and it has been really good in bringing up his wind and making him more comfortable.
ETA: Delay the jabs if you want to. Luca ended up being able 4 weeks behind on his jabs and it's done him no harm xx