Gerd?

My baby is 5.5 months old and is showing all of the signs and symptoms of GERD. We’ve tried everything from the doctors including gaviscon, carobel and omeprazole all of which didn’t work. We’ve also tried infacol/gripe water which made it worse. I’m basically at my wits end. The doctors just tell me that if nothing is working then just to let it naturally fade out, but she’s nearly 6 months old and it hasn’t got any better. For context : - Silent reflux since birth, even hours after her feed she still brings some up - very fussy on her bottle, spits it out every oz and then barely drinks the rest of it without being really fussy or irritable - always a high pitch wheezing when she’s asleep - sometimes gags or chokes when feeding - very slow in gaining weight (she’s only 12lb 11oz at nearly 6 months) I’ve spent so much money already trying to establish what’s going on, and I fear that me paying a further £200 for an oral assessment will come back saying nothing is wrong. (I know my babies health is priceless but I’m on SMP and have spent hundreds already trying to figure out the source) if I get an oral assessment done and it shows nothing, do I still pay full price? My partner, my babies dad had GERD as a child and had to have an operation to correct it. Could it be hereditary? I’m just at a loss and don’t know what else to do, my GP says we’ve tried everything 😞