There isn't anything that our hospitals use. Just leave them alone, don't stand in the hot shower facing forward, wear a supportive bra. But, you may want to ask the question of the Midwifery Today forums, you can probably find info just by searching that site. I know there are complimentary therapies (herbs, etc.) that the midwives are very knowledgable about.
www.midwiferytoday.com/forums