I'm so sorry! I'd been hoping you were on track (at least somewhat) at this point.
Although it certainly sounded like the DGE (or whatever is looking like it) was still going to need to be addressed somehow.
Have you checked via the "Finding your Tribe" board to see if anyone there can recommend an alternate GI in the area that you could make an appointment with - someone they've had luck with? Possibly check with your local LLL or AP group if you've any contacts with groups like that? Maybe someone there can recommend another local Ped GI who was helpful for them?
Otherwise, the train option might do it for you! It's worth a try.
In terms of homemade formula - I've never been in a position where *nothing* worked, since the Neocate did work for us and since we were able to find an ED which worked for us, too. I, too, would be very leery of homemade formulas. My sister's husband has a family story about a set of twins who couldn't nurse nor digest formula, who ended up surviving (and living to be old, old ladies) on the syrup from canned peaches (!) - but truly, there have to be such huge nutrition concerns when you go that route. Let's hope you can find a solution to what we suspect is something like DGE which you're dealing with -- I wonder whether resolving that might bring the allergy issues more clearly in line and set you on a path to manageability.
Is your dh going to be at the appointment Monday with you? Game plan it out first - make sure you both are able to ask questions during the appointment. Maybe this doctor will listen more to your dh than to you? Abhorrent as that would be .... If you didn't have the opportunity to say it to him last time, I'd be tempted, if he starts to brush you off again, to say something like, "Look, Dr. X - I have had two other children, one of whom had reflux as well. I have a college degree [I'm assuming], I am an intelligent woman, and my baby is not well. I have done everything I've been asked to and more, and she is not improving. She is not a "fussy" baby. She is a miserable, suffering baby who spends most of her time crying. I need you to help us figure this out, or to refer us to someone who can help us because this is not normal, and it is not livable, and we need your help."