I have been struggling with fibrocystic breasts - the pain starts 10 days after the first day of my cycle. About 3 weeks ago I started on Vit E (400iu) and CoQ10 which is supposed to be very helpful. I also realized I was very deficient in Vit D so I started on it. I'm noticing a difference already.
I will incorporate iodine once I get my Vit D level stabilized as I think the deficiency worsens the detox that comes with iodine. A Vit D deficiency can make you uncomfortable in both your groin and armpits which really contributes to the breast pain since it is so near your armpit.
Also I have read that Vit D does help balance estrogen.