Sea salt helped me tremendously --- I use Celtic salt (appr 1/4 tsp in every glass of water I drink). My first symptom of AF (before the fatigue) was insatiable thirst and incessant peeing --- it was impacting my sleep! I was tested for diabetes and diabetes insipidus. The doctor suggested that I limit my fluid intake :-) ANyway, the sea salt has been a lifesaver.
I've read the same about bone health -- in fact, I got a bone density scan recently and see that I am borderline osteoporitic. I've read a bit about silica and it's part in bone as well as collagen production.