Anyone else vitamin D deficient while breastfeeding?

I just found out I'm deficient and was prescribed a 50,000 IU/week pill, but hesitate to take it because it is a class C medication (also may contain soy and peanuts) and over the RDA while breastfeeding. I also read on safefetus.com that it can cause hyperclamcia in nursing infants: http://safefetus.com/DrugDetail.asp?DrugId=1229&TradeName=Ergocalciferol&TradeId=2716.

What did you do to get your vitamin D intake up? (note I can't change my diet to add more vitamin D rich foods because DS has severe food allergies and we only have 7 safe foods for myself at this time)