Please contact La Leche League, they are experts on breastfeeding and as this is an unusual situation they would be the best people to talk to. If they personally haven't heard of a similar case they have a complete network of people who would be able to help. They also have the most up to date information about the affects of medications on breast milk.
Maggie 2817 7475
Margarita 2257 6757
Rochelle 2947 7147
Sarah 2548 7636
LLLHK@hotmail.com
Good luck