Yep, totally normal for greys to pop in. My once bouncy, wavy almost curly pre-op hair is stick straight now, and my natural color is lighter than it was pre-op.
As for the shedding, it lasts anywhere between 2-6 months for the averages.
Nothing will stop it, even biotin doesn't guarantee regrowth. Just keep up with your vitamins to include iron and zinc, healthy fats be it from food or Omega3 supplement(which I got from ground flax seed added to my food), and push fluids to get rid of the toxins.
Band to VSG revision: June 3, 2009
SW 270lbs GW 150lbs CW Losing Pregancy Weight Maintenance goal W 125-130lbs