I also had this phenomenon and nursing was very painful (I was also overproducing and have a baby that likes to clamp down, so this contributed to the pain,too). My son is now 3 months and the pain is finally better and I am still nursing.
I used the lactation consultants at the Infant Feeding Center at Abbott Hospital and had a great experience. They were extremely helpful & supportive--and very logical in their approach. To help with the Raynaud's, I put warm washcloths on my nipples after nursing. The lactation nurse also prescribed me an all-purpose nipple ointment which was way better than lanolin (which only made my nipples more irritated and was painful to apply probably because of the Raynaud's).
My last advice with Raynaud's is that anytime you can NOT wear a bra or tight nursing tank, go for it. The restriction of wearing something tight fitting only aggrivated the Raynaud's for me. I'm guessing this is because it only further restricted blood flow. I know this is hard when your breasts are so heavy & all you want is something to support and hold them up, but it really helped make the pain subside for me.
I hope this info helps--sorry it got a little wordy. I know how hard it is to "push through the pain" as everyone likes to say & I'm sure you've heard a million times.