calcium, vitamin K2 and heart attacks - thoughts please!

I've been taking 1000 mg calcium citrate daily plus additional vit D and struggling with vit K2 on and off. I feel I ought to take vit K2 to prevent hardening of the arteries but find it bloats me - anyone else have that? I've had breast cancer and on a hormone blocker that thins the bones, and have osteopenia.

And now, I have found this article ... http://articles.mercola.com/sites/articles/archive/2012/01/30/calcium-supplement-on-heart-attack.aspx I feel totally lost as to what the best plan of action would be.

Thoughts anyone?

Thanks, Cherry