I've had breastpain for a long time, and this last year it's been really severe, and not just before my period, seemingly at other random times. I read that flaxseed was supposed to be good for this, so I started taking it as recommended; one tablespoon of ground flaxseed in the morning and one at night. (It's also a remedy which is not at all offensive to take. It tastes good to me).
And, unless it's a fluke, I seem to be cured! Sometimes I forget to take it and I get the start of some pain, but when I start taking it regularly again it disappears once more. Amazing!