Google is your friend
https://www.google.com/search?.....8;ie=UTF-8
i have no idea how well these places perform, but you can get custom bras made. I definitely hear your pain, NOTHING fits me off the rack. i alter jackets, dresses, tops, pants, skirts, yes and bras and panties. If the only problem is the band is too big thank your stars and take the durn thing in! It is also entirely possible to take in a little bit too large cup (if it's of a stable material you get best results).
The fantasy of our free-market economy is that everyone should be able to buy exactly what suits them off the rack - don't get me started on the many many ways that idea is pure bunk!
but seriously, best of luck Suz - talking to Angie's bra fitter sounds like a really good idea, if you sent her your measurements and some pics from various angles my guess is she could give you some meaningful help (bra fitting IS an incredible art!)
For the truly desperate who are handy or just persistent, there's oddles of online info on making your own bras. Just search for 'how to make your own bras'. Via online sources you can buy kits, etc.
Good luck, this type of thing drives me absolutely nuts! just keep trying and thinking and you'll come up with a solution that works for you, i promise steph