Oh sweetheart I am glad that you have someone on your side now but I am sorry to hear that your paed does think an endoscopy might be necessary! We had one with DS when he was 18 months old and tbh it wasn't too bad, the docs and nurses were VERY reassuring and they brought him to before I saw him so the first I heard was him crying (relief!)...
I hope that the new HA formula works, my DS went onto an elemental formula for some time to rule out MSPI and he took that well even though he was older, so you do still have formula options
Also happy your paed said no to solids. I think there is quite a bit of research that suggests against early intro, especially in babies with reflux due to the possibility of allergies and exacerbating the pain.
For teeth pain (which will make the reflux flare btw) don't give neurofen (ibuprofen) as it is not very gentle on refluxers tummies (if bub ever has a high temp that paracetamol won't hold down then it's ok to use, but only on rare occasions), try some paracetamol and see if it helps xx
More hugs sweetheart, keep us updated on how you are going xox Oh and there is a chat group of reflux mummies over on the reflux site, you should join, lots of lovely and clever mummies there:
http://babywhispererforums.com/index.php?topic=174117.0xxLizzie