I've helped a girl with a similar problem as you before. We went to get some custom bras designed for her... It costs a little more, but you'll look proper and it will provide you with the support you need.

Justin-
you seem to know a lot about things. Where could I go to find these custom bras? How much more expensive are they? Is there another alternative?
-heather

I'm a size 28F. No joke.
Super skinny parents, just I got the big breast genes from my mom's mother.

I go to figleaves.com which has many bras in a wide range of sizes.
Unfortunately, many bras that I buy are fairly expensive, but it's worth it to be comfortable and have a bra that fits and supports.

Good luck!

(I'd be interested to know about custom bras too, actually.)

yes, figleaves.com is the way to go. u can find specialty bras online. i'm a 32E and i order my bras online.

Yeah, figleaves is pretty much a miracle.
Just I hate having to cough up so much money.